Leggett & Platt (LEG) 10-Q 2012 Q3 Quarterly report

Exhibit 32.2

CERTIFICATION 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 Leggett & Platt, Incorporated (the “Company”) on Form 10-Q for the period ending September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Matthew C. Flanigan, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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 Company.

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

/s/ Matthew C. Flanigan

Matthew C. Flanigan

Senior Vice President and Chief Financial Officer

November 8, 2012