Principal Financial (PFG) 10-K 2016 FY Annual report

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Exhibit 32.2

Certification Pursuant to Section 1350 of Chapter 63
of Title 18 of the United States Code

        I, Terrance J. Lillis, Executive Vice President and Chief Financial Officer of Principal Financial Group, Inc., certify that (i) the Form 10-K for the period ended December 31, 2016, fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-K for the period ended December 31, 2016, fairly presents, in all material respects, the financial condition and results of operations of Principal Financial Group, Inc.

/s/ TERRANCE J. LILLIS
Terrance J. Lillis
Executive Vice President and Chief Financial Officer
Date: February 8, 2017

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Exhibit 32.2

Certification Pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code