Casey's General Stores (CASY) 10-K 2005 FY Annual report

Exhibit 32.2

CERTIFICATE PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Casey’s General Stores, Inc. (the Company) on Form 10-K for the fiscal year ended April 30, 2005 as filed with the Securities and Exchange Commission on the date hereof (the Report), I, William J. Walljasper, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934.

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ William J. Walljasper

William J. Walljasper

Chief Financial Officer

July 11, 2005