EXHIBIT 32.2


                    CERTIFICATION OF CHIEF FINANCIAL OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350

         In connection with the quarterly report of Input/Output, Inc. (the
"Company") on Form 10-Q for the period ended June 30, 2004, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, J.
Michael Kirksey, Executive Vice President and Chief Financial 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:

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

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


         Date: August 9, 2004                   /s/ J. Michael Kirksey
                                       -----------------------------------------
                                       J. Michael Kirksey
                                       Executive Vice President and
                                       Chief Financial Officer