UNDERWRITING AGREEMENT

Exhibit 1.1

EXECUTION COPY

PNC Funding Corp, Issuer

and

The PNC Financial Services Group, Inc., Guarantor

Underwriting Agreement

New York, New York

September 29, 2006

To the Representative

    named in Schedule I

    hereto of the

    Underwriters named in

    Schedule II hereto

Dear Ladies and Gentlemen:

PNC Funding Corp, a Pennsylvania corporation (the “Company”), proposes to sell to the underwriters named in Schedule II hereto (the “Underwriters”), for whom you are acting as representatives (the “Representatives”), the principal amount of its securities identified in Schedule I hereto (together with the guarantees mentioned below, the “Securities”) to be guaranteed by The PNC Financial Services Group, Inc., a Pennsylvania corporation (the “Guarantor”), and to be issued under an indenture dated as of December 1, 1991, among the Company, the Guarantor and JPMorgan Chase Bank, N.A. (formerly known as JPMorgan Chase Bank, which was formerly known as The Chase Manhattan Bank, which was formerly known as Chemical Bank, successor by merger to Manufacturers Hanover Trust Company), as trustee (the “Trustee”), as amended by a Supplemental Indenture dated as of February 15, 1993, among the Company, the Guarantor and the Trustee, and as further amended by a Second Supplemental Indenture dated as of February 15, 2000 (as amended, the “Indenture”). If the firm or firms listed in Schedule II hereto include only the firm or firms listed in Schedule I hereto, then the terms “Underwriters” and “Representatives,” as used herein, shall each be deemed to refer to such firm or firms.

Section 1. Representations and Warranties . The Company and the Guarantor represent and warrant to, and agree with, each Underwriter as set forth below in this Section 1. Certain terms used in this Section 1 are defined in paragraph (c) hereof.

(a) If the offering of the Securities is a Delayed Offering (as specified in Schedule I hereto), paragraph (i) below is applicable and, if the offering of the Securities is a Non-Delayed Offering (as so specified), paragraph (ii) below is applicable.

(i) The Company and the Guarantor meet the requirements for the use of Form S-3 under the Securities Act of 1933 (the “Act”) and

have filed with the Securities and Exchange Commission (the “Commission”) a registration statement (the file number of which is set forth in Schedule I hereto), on such Form, including a basic prospectus, for registration under the Act of the offering and sale of the Securities. The Company and the Guarantor may have filed one or more amendments thereto, and may have used a Preliminary Final Prospectus, each of which has previously been furnished to you. Such registration statement, as so amended, has become effective. The offering of the Securities is a Delayed Offering and, although the Basic Prospectus may not include all information with respect to the Securities and the offering thereof required by the Act and the rules thereunder to be included in the Final Prospectus, the Basic Prospectus includes all such information required by the Act and the rules thereunder to be included therein as of the Effective Date. The Company and the Guarantor will next file with the Commission pursuant to Rules 415 and 424(b)(2) or (5) a final supplement to the form of prospectus included in such registration statement relating to the Securities and the offering thereof. As filed, such final prospectus supplement shall include all required information with respect to the Securities and the offering thereof and, except to the extent the Representatives shall agree in writing to a modification, shall be in all substantive respects in the form furnished to you prior to the Execution Time or, to the extent not completed at the Execution Time, shall contain only such specific additional information and other changes (beyond that contained in the Basic Prospectus, any Preliminary Final Prospectus and the Pricing Disclosure Package) as the Company has advised you, prior to the Execution Time, will be included or made therein.

(ii) The Company and the Guarantor meet the requirements for the use of Form S-3 under the Act and have filed with the Commission a registration statement (the file number of which is set forth in Schedule I hereto) on such Form, including a basic prospectus, for registration under the Act of the offering and sale of the Securities. The Company and the Guarantor may have filed one or more amendments thereto, including a Preliminary Final Prospectus, each of which has previously been furnished to you. The Company and the Guarantor will next file with the Commission either (x) a final prospectus supplement relating to the Securities in accordance with Rules 430A and 424(b)(1) or (4), or (y) prior to the effectiveness of such registration statement, an amendment to such registration statement, including the form of final prospectus supplement. In the case of clause (x), the Company and the Guarantor included in such registration statement, as amended at the Effective Date, all information (other than Rule 430A Information) required by the Act and the rules thereunder to be included in the Final Prospectus with respect to the Securities and the offering thereof. As filed, such final prospectus supplement or such amendment and form of

2

final prospectus supplement shall contain all Rule 430A Information, together with all other such required information, with respect to the Securities and the offering thereof and, except to the extent the Representatives shall agree in writing to a modification, shall be in all substantive respects in the form furnished to you prior to the Execution Time or, to the extent not completed at the Execution Time, shall contain only such specific additional information and other changes (beyond that contained in the Basic Prospectus and any Preliminary Final Prospectus) as the Company has advised you, prior to the Execution Time, will be included or made therein.

(b) On the Effective Date, the Registration Statement did or will, at the Applicable Time and on the Closing Date the Pricing Disclosure Package did or will, and when the Final Prospectus is first filed (if required) in accordance with Rule 424(b) and on the Closing Date, the Final Prospectus (and any supplement thereto) will, comply in all material respects with the applicable requirements of the Act and the Securities Exchange Act of 1934 (the “Exchange Act”) and the respective rules thereunder; on the Effective Date, the Registration Statement did not or will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading; at the Applicable Time and on the Closing Date, the Pricing Disclosure Package did not or will not, include any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading; and each Issuer Free Writing Prospectus listed on Schedule III does not conflict with the information contained in the Registration Statement, the Pricing Disclosure Package or the Final Prospectus and each such Issuer Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein in the light of the circumstances under which they were made, not misleading; and, on the Effective Date, the Final Prospectus, if not filed pursuant to Rule 424(b), did not or will not, and on the date of any filing pursuant to Rule 424(b) and on the Closing Date, the Final Prospectus (together with any supplement thereto) will not, include any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided , however , that the Company and the Guarantor make no representations or warranties as to (i) that part of the Registration Statement which shall constitute the Statement of Eligibility and Qualification (Form T-1) under the Trust Indenture Act of the Trustee or (ii) the information contained in or omitted from the Registration Statement, the Pricing Disclosure Package or the Final Prospectus (or any supplement thereto) in reliance upon and in conformity with information furnished in writing to the Company or the Guarantor by or on behalf of any Underwriter through the Representatives specifically for use in connection with the preparation of the Registration Statement or the Final Prospectus (or any supplement thereto).

3

(c) The terms that follow, when used in this Agreement, shall have the meanings indicated. The term “the Effective Date” shall mean each date that the Registration Statement and any post effective amendment or amendments thereto became or become effective. “Execution Time” shall mean the date and time that this Agreement is executed and delivered by the parties hereto. “Applicable Time” shall mean 1:54 p.m. (Eastern Time) on the date of the Agreement. “Basic Prospectus” shall mean the prospectus referred to in paragraph (a) above contained in the Registration Statement at the Effective Date including, in the case of a Non-Delayed Offering, any Preliminary Final Prospectus. “Preliminary Final Prospectus” shall mean any preliminary prospectus supplement to the Basic Prospectus which describes the Securities and the offering thereof and is used prior to filing of the Final Prospectus. “Pricing Disclosure Package” shall mean the Basic Prospectus (as amended and supplemented immediately prior to the Applicable Time) and any Preliminary Final Prospectus as supplemented by the final term sheet prepared and filed pursuant to Section 4(a) hereof. “Final Prospectus” shall mean the prospectus supplement relating to the Securities that is first filed pursuant to Rule 424(b) after the Execution Time, together with the Basic Prospectus or, if, in the case of a Non-Delayed Offering, no filing pursuant to Rule 424(b) is required, shall mean the form of final prospectus relating to the Securities, including the Basic Prospectus, included in the Registration Statement at the Effective Date. “Issuer Free Writing Prospectus” shall mean any “issuer free writing prospectus” as defined in Rule 433. “Registration Statement” shall mean the registration statement referred to in paragraph (a) above, including incorporated documents, exhibits and financial statements, as amended at the Execution Time (or, if not effective at the Execution Time, in the form in which it shall become effective) and, in the event any post effective amendment thereto becomes effective prior to the Closing Date (as hereinafter defined), shall also mean such registration statement as so amended. Such term shall include any Rule 430 Information deemed to be included therein at the Effective Date as provided by Rule 430A, Rule 430B or Rule 430C. “Rule 405,” “Rule 415,” “Rule 424,” “Rule 430A”, “Rule 430B,” “Rule 430C,” “Rule 433” and “Regulation S-K” refer to such rules or regulation under the Act. “Rule 430 Information” means information with respect to the Securities and the offering thereof permitted to be omitted from the Registration Statement when it becomes effective pursuant to Rule 430A, Rule 430B or Rule 430C. Any reference herein to the Registration Statement, the Basic Prospectus, any Preliminary Final Prospectus, the Pricing Disclosure Package or the Final Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 which were filed under the Exchange Act on or before the Effective Date of the Registration Statement or the issue date of the Basic Prospectus, any Preliminary Final Prospectus, the Pricing Disclosure Package or the Final Prospectus, as the case may be; and any reference herein to the terms “amend,” “amendment” or “supplement” with respect to the Registration Statement, the Basic Prospectus, any Preliminary Final Prospectus or the Final Prospectus shall be deemed to refer to and include the filing of any document under the Exchange Act after the Effective Date of the Registration

4

Statement or the issue date of the Basic Prospectus, any Preliminary Final Prospectus or the Final Prospectus, as the case may be, deemed to be incorporated therein by reference. A “Non-Delayed Offering” shall mean an offering of securities which is intended to commence promptly after the effective date of a registration statement, with the result that, pursuant to Rules 415 and 430A, all information (other than Rule 430A Information) with respect to the securities so offered must be included in such registration statement at the effective date thereof. A “Delayed Offering” shall mean an offering of securities pursuant to Rule 415 which does not commence promptly after the effective date of a registration statement, with the result that only information required pursuant to Rule 415 need be included in such registration statement at the effective date thereof with respect to the securities so offered. Whether the offering of the Securities is a Non-Delayed Offering or a Delayed Offering shall be set forth in Schedule I hereto.

Section 2. Purchase and Sale . Subject to the terms and conditions and in reliance upon the representations and warranties herein set forth, the Company agrees to, and the Guarantor agrees to cause the Company to, sell to each Underwriter, and each Underwriter agrees, severally and not jointly, to purchase from the Company, at the purchase price set forth in Schedule I hereto the principal amount of the Securities set forth opposite such Underwriter’s name in Schedule II hereto, except that, if Schedule I hereto provides for the sale of Securities pursuant to delayed delivery arrangements, the respective principal amounts of Securities to be purchased by the Underwriters shall be as set forth in Schedule II hereto less the respective amounts of Contract Securities determined as provided below. Securities to be purchased by the Underwriters are herein sometimes called the “Underwriters’ Securities” and Securities to be purchased pursuant to Delayed Delivery Contracts as hereinafter provided are herein called “Contract Securities.”

If so provided in Schedule I hereto, the Underwriters are authorized to solicit offers to purchase Securities from the Company pursuant to delayed delivery contracts (“Delayed Delivery Contracts”), substantially in the form of Schedule IV hereto but with such changes therein as the Company and the Guarantor may authorize or approve. The Underwriters will endeavor to make such arrangements and, as compensation therefor, the Company will pay, and the Guarantor will cause the Company to pay, to the Representatives, for the account of the Underwriters, on the Closing Date, the percentage set forth in Schedule I hereto of the principal amount of the Securities for which Delayed Delivery Contracts are made. Delayed Delivery Contracts are to be with institutional investors, including commercial and savings banks, insurance companies, pension funds, investment companies and educational and charitable institutions. The Company will enter into, and the Guarantor will cause the Company to enter into, Delayed Delivery Contracts in all cases where sales of Contract Securities arranged by the Underwriters have been approved by the Company but, except as the Company may otherwise agree, each such Delayed Delivery Contract must be for not less than the minimum principal amount set forth in Schedule I hereto and the aggregate principal amount of Contract Securities may not exceed the maximum aggregate principal amount set forth in Schedule I hereto. The Underwriters will not have any responsibility in

5

respect of the validity or performance of Delayed Delivery Contracts. The principal amount of Securities to be purchased by each Underwriter as set forth in Schedule II hereto shall be reduced by an amount which shall bear the same proportion to the total principal amount of Contract Securities as the principal amount of Securities set forth opposite the name of such Underwriter bears to the aggregate principal amount set forth in Schedule II hereto, except to the extent that you determine that such reduction shall be otherwise than in such proportion and so advise the Company in writing; provided , however , that the total principal amount of Securities to be purchased by all Underwriters shall be the aggregate principal amount set forth in Schedule II hereto less the aggregate principal amount of Contract Securities.

Section 3. Delivery and Payment . Delivery of and payment for the Underwriters’ Securities shall be made on the date and at the time specified in Schedule I hereto (or such later date not later than five business days after such specified date as the Representatives shall designate), which date and time may be postponed by agreement among the Representatives, the Company and the Guarantor or as provided in Section 8 hereof (such date and time of delivery and payment for the Underwriters’ Securities being herein called the “Closing Date”). Delivery of the Underwriters’ Securities shall be made to the Representatives for the respective accounts of the several Underwriters against payment by the several Underwriters through the Representatives of the purchase price thereof to or upon the order of the Company by wire transfer of immediately available funds. Delivery of the Underwriters’ Securities shall be made at such location in The City of New York as the Representatives shall reasonably designate at least one business day in advance of the Closing Date and payment for the Securities shall be made at the office specified in Schedule I hereto. Certificates for the Underwriters’ Securities shall be registered in such names (including the nominee for any depositary which will hold Securities to be established for “book entry” issuance and transfer) and in such denominations as the Representatives may request not less than two full business days in advance of the Closing Date.

The Company and the Guarantor agree to have the Underwriters’ Securities available for inspection, checking and packaging by the Representatives in New York, New York, not later than 1:00 p.m. on the business day prior to the Closing Date.

Section 4. Agreements . The Company and the Guarantor jointly and severally agree with the several Underwriters that:

(a) The Company and the Guarantor will use their best efforts to cause the Registration Statement, if not effective at the Execution Time, and any amendment thereto, to become effective. Prior to the termination of the offering of the Securities, the Company and the Guarantor will not file any amendment to the Registration Statement or supplement (including the Final Prospectus or any Preliminary Final Prospectus) to the Basic Prospectus unless the Company and the Guarantor have furnished you a copy for your review prior to filing and will not file any such proposed amendment or supplement to which you reasonably object. Subject to the foregoing sentence, the Company and the Guarantor will cause the Final Prospectus, properly completed, and any supplement thereto to be

6

filed with the Commission pursuant to the applicable paragraph of Rule 424(b) within the time period prescribed; will prepare a final term sheet, containing solely a description of the Securities in a form approved by you and will file such term sheet pursuant to Rule 433(d) within the time period prescribed; will promptly file all other material required to be filed by the Company and the Guarantor with the Commission pursuant to Rule 433(d) and will provide evidence satisfactory to the Representatives of such timely filing. The Company and the Guarantor will promptly advise the Representatives (i) when the Registration Statement, if not effective at the Execution Time, and any amendment thereto, shall have become effective, (ii) when the Final Prospectus, and any supplement thereto, shall have been filed with the Commission pursuant to Rule 424(b), (iii) when any Issuer Free Writing Prospectus shall have been field with the Commission, (iv) when, prior to termination of the offering of the Securities, any amendment to the Registration Statement shall have been filed or become effective, (v) of any request by the Commission for any amendment of the Registration Statement or supplement to the Final Prospectus or for any additional information, (vi) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the institution or threatening of any proceeding for that purpose and (vii) of the receipt by the Company or the Guarantor of any notification with respect to the suspension of the qualification of the Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose. The Company and the Guarantor will use their best efforts to prevent the issuance of any such stop order and, if issued, to obtain as soon as possible the withdrawal thereof.

(b) If, at any time when a prospectus relating to the Securities is required to be delivered (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) under the Act, any event occurs as a result of which the Final Prospectus as then supplemented would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of the circumstances under which they were made not misleading, or if it shall be necessary to amend the Registration Statement or supplement the Final Prospectus to comply with the Act or the Exchange Act or the respective rules thereunder, the Company and the Guarantor promptly will prepare and file with the Commission, subject to the second sentence of paragraph (a) of this Section 4, an amendment or supplement which will correct such statement or omission or effect such compliance.

(c) As soon as practicable, the Guarantor will make generally available to its security holders and to the Representatives an earnings statement or statements of the Guarantor and its subsidiaries which will satisfy the provisions of Section 11(a) of the Act and Rule 158 under the Act.

(d) The Company and the Guarantor will furnish to the Representatives and counsel for the Underwriters, without charge, copies of the Registration Statement (including exhibits thereto) and, so long as delivery of a prospectus by an Underwriter or dealer may be required by the Act, as many

7

copies of any Preliminary Final Prospectus, the Final Prospectus and each Issuer Free Writing Prospectus and any supplement thereto as the Representatives may reasonably request. The Company and the Guarantor will pay the expenses of printing or other production of all documents relating to the offering.

(e) The Company and the Guarantor will use their best efforts to arrange for the qualification of the Securities for sale under the laws of such jurisdictions as the Representatives may designate, will maintain such qualifications in effect so long as required for the distribution of the Securities and will arrange for the determination of the legality of the Securities for purchase by institutional investors; provided , however , that neither the Company nor the Guarantor shall be required to qualify to do business in any jurisdiction where it is not now qualified or to take any action which would subject it to general or unlimited service of process in any jurisdiction where they are not now subject.

(f) Until the business day following the Closing Date, the Company and the Guarantor will not, without the consent of the Representatives, offer, sell or contract to sell, or announce the offering of, any debt securities covered by the Registration Statement or any other registration statement filed under the Act.

Section 5. Additional Agreements Relating to Free Writing Prospectuses.

(a) The Company and the Guarantor represent and agree that, other than the final term sheet prepared and filed pursuant to Section 4(a) hereof, without the prior consent of the Representatives, they have not made and will not make any offer relating to the Securities that would constitute a “free writing prospectus” as defined in Rule 405.

(b) Each Underwriter represents and agrees that, without the prior consent of the Company and the Representatives, other than one or more term sheets relating to the Securities containing customary information that do not require the Company or the Guarantor to file any material pursuant to Rule 433(d) except for the final term sheet prepared and filed pursuant to Section 4(a) hereof, it has not made and will not make any offer relating to the Securities that would constitute a free writing prospectus.

(c) Any free writing prospectus the use of which has been consented to by the Company and the Representatives (including the final term sheet prepared and filed pursuant to Section 4(a) hereof) is listed on Schedule III hereto.

(d) The Company and the Guarantor have complied and will comply with the requirements of Rule 433 applicable to any Issuer Free Writing Prospectus, including timely filing with the Commission or retention where required and legending.

(e) The Company and the Guarantor agree that if at any time following issuance of an Issuer Free Writing Prospectus any event occurred or

8

occurs as a result of which such Issuer Free Writing Prospectus would conflict with the information in the Registration Statement, the Pricing Disclosure Package or the Final Prospectus or would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, the Company and the Guarantor will give prompt notice thereof to the Representatives and, if requested by the Representatives, will prepare and furnish without charge to each Underwriter an Issuer Free Writing Prospectus or other document which will correct such conflict, statement or omission.

Section 6. Conditions to the Obligations of the Underwriters . The obligations of the Underwriters to purchase the Underwriters’ Securities shall be subject to the accuracy of the representations and warranties on the part of the Company and the Guarantor contained herein as of the Execution Time and the Closing Date, to the accuracy of the statements of the Company and the Guarantor made in any certificates pursuant to the provisions hereof, to the performance by the Company and the Guarantor of their obligations hereunder and to the following additional conditions:

(a) If the Registration Statement has not become effective prior to the Execution Time, unless the Representatives agree in writing to a later time, the Registration Statement will become effective not later than (i) 6:00 p.m. New York City time, on the date of determination of the public offering price, if such determination occurred at or prior to 3:00 p.m. New York City time on such date or (ii) 12:00 Noon on the business day following the day on which the public offering price was determined, if such determination occurred after 3:00 p.m. New York City time on such date; if fil