Exhibit 32.1

Section 1350 Certification,

As Adopted Pursuant To

Section 906 of The Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Magma Design Automation, Inc. (the “Company”) on Form 10-Q for the period ending January 1, 2006, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Rajeev Madhavan, Chief Executive Officer of the Company, certify to the best of my knowledge, 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) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company for the periods presented therein.

/s/    RAJEEV MADHAVAN        

Rajeev Madhavan

Chief Executive Officer

February 9, 2006

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