Exhibit 32.2

                 CERTIFICATION BY THE CO-CHIEF EXECUTIVE OFFICER
                PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT


In connection with the Quarterly  Report of Silgan Holdings Inc. (the "Company")
on Form 10-Q for the period  ended March 31,  2005 as filed with the  Securities
and Exchange Commission on the date hereof (the "Quarterly Report"),  I, D. Greg
Horrigan,  Co-Chief  Executive Officer of the Company,  certify,  pursuant to 18
U.S.C.  Section 1350, as adopted  pursuant to Section 906 of the  Sarbanes-Oxley
Act of 2002, that, to my knowledge:

     (1) The Quarterly  Report fully complies with the  requirements  of Section
     13(a) or 15(d) of the Securities Exchange Act of 1934; and

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


/s/ D. Greg Horrigan
- --------------------
D. Greg Horrigan
Co-Chairman of the Board and Co-Chief Executive Officer

May 10, 2005


A signed  original of this  written  statement  required by Section 906 has been
provided to Silgan  Holdings  Inc. and will be retained by Silgan  Holdings Inc.
and  furnished  to the  Securities  and  Exchange  Commission  or its staff upon
request.