EX-99.906CERT

Registrant Name: CGM Capital Development Fund

File Number: 811-00933

Registrant CIK Number: 0000060332

Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

The undersigned officers of the CGM Capital Development Fund (the "Registrant
"), with respect to the Registrant's Form N-CSR for the six-month period ended
December 31, 2006 as filed with the Securities and Exchange Commission, each
hereby certify that, to the best of such officer's knowledge:

         1. the Registrant's Form N-CSR 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 such Form N-CSR fairly presents, in
            all material respects, the financial condition and results of
            operations of the Registrant.

Date:  February 26, 2007

/s/ Robert L. Kemp
Robert L. Kemp
President
Principal Executive Officer


Date:  February 26, 2007

/s/ Jem A. Hudgins
Jem A. Hudgins
CFO & Treasurer
Principal Financial Officer

This certification is being furnished to the Securities and Exchange Commission
solely pursuant to 18 U.S.C. 1350 and is not being filed as part of the Form
N-CSR filed with the Commission.