EXHIBIT 32(a)

Certification Pursuant to Section 1350 of Chapter 63
of Title 18 of the United States Code

I, William Perez, the Chief Executive Officer of Wm. Wrigley Jr. Company (the “Company”), certify that to the best of my knowledge:

(i)	the Quarterly Report of the Company on the Form 10-Q dated May 10, 2007 for the fiscal quarter ended March 31, 2007, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(ii)	the information contained in the said Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ WILLIAM D. PEREZ
	William D. Perez
	President and Chief Executive Officer
Dated the 10th day of May, 2007