POWER OF ATTORNEY

Alfred A. Piergallini



Know all by these presents, that the undersigned hereby constitutes and appoints each of Jon

W. Bilstrom, Nicole V. Gersch, T. Cormac McCarthy, and Robert W. Spencer, Jr., signing singly,

the undersigned's true and lawful attorney-in-fact to:



(1)  execute for and on behalf of the undersigned, in the undersigned's

capacity as an officer and/or director of Comerica Incorporated (the

"Company"), Forms 3, 4 and 5 in accordance with Section 16(a) of

yhe Securities Exchange Act of 1934 and the rules thereunder;



(2)  do and perform any and all acts for and on behalf of the undersigned

which may be necessary or desirable to complete and execute any

such Form 3, 4 or 5 and timely file such form with the United States

Securities and Exchange Commission and any stock exchange or

similar authority; and



(3)  take any other action of any type whatsoever in connection with the

foregoing which, in the opinion of such attorney-in-fact, may be of

benefit to, in the best interest of, or legally required by, the

undersigned, it being understood that the documents executed by such

attorney-in-fact on behalf of the undersigned pursuant to this Power

of Attorney shall be in such form and shall contain such terms and

conditions as such attorney-in-fact may approve in such attorney-in-

fact's discretion.



The undersigned hereby grants to each such attorney-in-fact full power and authority to do

and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the

exercise of any of the rights and powers herein granted, as fully to all intents and all purposes as the

undersigned might or could do if personally present, with full power of substitution or revocation,

hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or

substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights

and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in

serving in such capacity at the request of the undersigned, are not assuming, nor is the Company

assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934.



The termination of any attorney-in-fact's employment by the Company, however caused, shall

operate as a termination of his or her powers and authorities hereunder, but shall not affect the

powers and authorities herein granted to any other party.



This Power of Attorney shall remain in full force and effect until the undersigned is no longer

required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in

securities issued by the Company, unless earlier revoked by the undersigned in a signed writing

delivered to the foregoing attorneys-in-fact at the then current mailing address of the Corporate Legal

Department of Comerica Incorporated.



All Powers of Attorney previously granted in connection with the foregoing matters hereby

are canceled and revoked.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed and made effective as of this 26th day of July, 2005.





                                       /s/ Alfred A. Piergallini