EXHIBIT 99.1

                          CAPSTEAD MORTGAGE CORPORATION
                           CERTIFICATIONS 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 Quarterly Report of Capstead Mortgage Corporation (the
"Issuer") on Form 10-Q for the period ended March 31, 2003, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Wesley
R. Edens, Chairman and Chief Executive Officer of the Issuer, 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) 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 Issuer.



Date: May 6, 2003                     By: /s/ WESLEY R. EDENS
                                          --------------------------------------
                                          Wesley R. Edens
                                          Chairman and Chief Executive Officer

In connection with the Quarterly Report of Capstead Mortgage Corporation (the
"Issuer") on Form 10-Q for the period ended March 31, 2003, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Andrew
F. Jacobs, Executive Vice President - Finance of the Issuer, 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) 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 Issuer.

Date: May 6, 2003                     By: /s/ ANDREW F. JACOBS
                                          --------------------------------------
                                          Andrew F. Jacobs
                                          Executive Vice President - Finance