April 29, 2015

VIA EDGAR

Securities and Exchange Commission

450 Fifth Street, NW

Washington, DC 20549

RE:    Principal Life Insurance Company

Separate Account B

Principal Investment Plus Variable Annuity

Registration Statement on Form N-4

File No. 333-116220

I am Counsel for the above-referenced Registrant and have reviewed the attached post-effective amendment which is being filed pursuant to Rule 485(b) under the Securities Act of 1933. I hereby represent that the amendment does not contain disclosures which would render it ineligible to become effective pursuant to Rule 485(b).

Sincerely,

/s/ Doug Hodgson

Doug Hodgson

Counsel

711 High Street

Des Moines, Iowa 50392-0300

(515) 362-2384 (office)

(866) 496-6527 (facsimile)

hodgson.doug@principal.com