Principal Life Income Fundings Trust 37 424B2 Prospectus for primary offering

Pricing Supplement Dated April 18, 2008	Filed Pursuant to Rule 424(b)(2)
(To Prospectus dated November 21, 2007, and	Registration Statement Nos. 333-147181
Prospectus Supplement dated November 21, 2007)	and 333-147181-01
	CUSIP: 74254PYF3

Principal Life Insurance Company
Secured Medium-Term Notes (that are also Asset-Backed Securities)
Issued Through and Obligations of
Principal Life Income Fundings Trust 37 (the “Trust” and the “Issuing Entity”)

     The description of this pricing supplement of the particular terms of the Secured Medium-Term Notes offered hereby, and the Funding Agreement (specified below) issued by Principal Life Insurance Company (“Principal Life”) to the Trust, the payment obligations of which are fully and unconditionally guaranteed by the Guarantee (specified below) issued by Principal Financial Group, Inc. to the Trust, supplements the description of the general terms and provisions of the notes, the funding agreements and the guarantees set forth in the accompanying prospectus and prospectus supplement, to which reference is hereby made.

1.The Notes

Principal Amount:	$300,000,000	Purchasing Agent(s) Discount:	0.166%
Issue Price:	99.513%	Original Issue Date:	April 25, 2008
Net Proceeds to the Trust:	$298,539,000	Stated Maturity Date:	April 27, 2015

Specified Currency:	U.S. Dollars
Interest Payment Dates:	April 27 and October 27 of each year
Initial Interest Payment Date:	October 27, 2008
Regular Record Date:	15 calendar days prior to the Interest Payment Date

Type of Interest Rate:þ Fixed Rateo Floating Rate

          Fixed Rate Notes:þ Yeso No. If, Yes,

               Interest Rate: 5.550%

          Floating Rate Notes:o Yesþ No. If, Yes,

               Regular Floating Rate Notes:o Yeso No. If, Yes,

Interest Rate:
Interest Rate Basis(es):

               Floating Rate/Fixed Rate Note:o Yeso No. If, Yes,

Floating Interest Rate:
Interest Rate Basis(es):
Fixed Interest Rate:
Fixed Rate Commencement Date:

               Inverse Floating Rate Note:o Yeso No. If, Yes,

Fixed Interest Rate:
Floating Interest Rate:
Interest Rate Basis(es):

               Initial Interest Rate, if any:

               Initial Interest Rate, if any:

               Initial Interest Reset Date:

               Interest Rate Basis(es). Check all that apply:

o CD Rate	o Commercial Paper Rate
o CMT Rate	o Eleventh District Cost of Funds Rate
o Constant Maturity Swap Rate	o Federal Fund Open Rate
o LIBOR	o Federal Funds Rate
o EURIBOR	o Treasury Rate
o Prime Rate	o Other

If LIBOR:o LIBOR Reuters

LIBOR Currency:

If CMT Rate:

Designated Reuters Page:

If FEDCMT:o Weekly Averageo Monthly Average

Designated CMT Maturity Index:

               Index Maturity:

               Spread (+/-):

               Spread Multiplier:

               Interest Reset Date(s):

               Interest Rate Determination Date(s):

               Maximum Interest Rate, if any:

               Minimum Interest Rate, if any:

Calculation Agent: Citibank, N.A.

Exchange Rate Agent: Not applicable

Computation of Interest (not applicable unless different than as specified in the prospectus and prospectus supplement):

Day Count Convention (not applicable unless different than as specified in the prospectus and prospectus supplement):

Amortizing Notes:o Yesþ No. If, Yes,

               Amortizing Schedule:

               Additional/ Other Terms

Discount Note:o Yesþ No. If, Yes,

               Total Amount of Discount:

               Initial Accrual Period of Discount:

               Additional/Other Terms:

Redemption Provisions:o Yesþ No. If, Yes,

               Initial Redemption Date:

               Initial Redemption Percentage:

               Annual Redemption Percentage Reduction (if any):

               Redemptiono In whole only and not in part

                                     o May be in whole or in part

               Additional/Other Terms:

Repayment:o Yesþ No. If Yes,

               Repayment Date(s):

               Repayment Price:

               Repayment:o In whole only and not in part

  o May be in whole or in part

               Additional/Other Terms:

Sinking Fund (not applicable unless specified):

Additional Amounts to be Paid for Withholding Tax (not applicable unless specified):

Securities Exchange Listing:o Yesþ No. If Yes, Name of Exchange:

Authorized Denominations: $1,000

Ratings: The Notes issued under the Program are rated AA by Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc. (“S&P”). Principal Life expects the Notes to be rated Aa2 by Moody’s Investors Service, Inc. (“Moody’s”).

Purchasing Agent(s) Purchasing Notes as Principal:þ Yeso No. If Yes,

Purchasing Agent(s)	Principal Amount
Banc of America Securities LLC	$	100,000,000
Deutsche Bank Securities Inc.	$	100,000,000
J.P. Morgan Securities Inc.	$	100,000,000
Total:	$	300,000,000

Purchasing Agent(s) Acting as Agent:o Yesþ No. If Yes,

Purchasing Agent(s)	Principal Amount
Total:

State of Organization of Trust: New York

Additional/Other Terms:

Special Tax Considerations:

2.The Funding Agreement

Funding Agreement Issuer:	Principal Life Insurance Company
Funding Agreement No.:	4-55455
Deposit Amount:	$300,000,015
Net Deposit:	$298,539,000
Effective Date:	April 25, 2008
Stated Maturity Date:	April 27, 2015
Specified Currency:	U.S. Dollars
Interest Payment Dates:	April 27 and October 27 of each year
Initial Interest Payment Date:	October 27, 2008
Type of Interest Rate:	þ Fixed Rateo Floating Rate

               Fixed Rate Funding Agreement:þ Yeso No. If, Yes,

               Interest Rate: 5.550%

               Floating Rate Funding Agreement:o Yesþ No. If, Yes,

Regular Floating Rate Funding Agreement:o Yeso No. If Yes,

Interest Rate:
Interest Rate Basis(es):

Floating Rate/Fixed Rate Funding Agreement:o Yeso No. If, Yes,

Floating Interest Rate:
Interest Rate Basis(es):
Fixed Interest Rate:
Fixed Rate Commencement Date:

Inverse Floating Rate Funding Agreement:o Yeso No. If, Yes,

Fixed Interest Rate:
Floating Interest Rate:
Interest Rate Basis(es):

               Initial Interest Rate, if any:

               Initial Interest Reset Date:

               Interest Rate Basis(es). check all that apply

o CD Rate	o Commercial Paper Rate
o CMT Rate	o Eleventh District Cost of Funds Rate
o Constant Maturity Swap Rate	o Federal Funds Open Rate
o LIBOR	o Federal Funds Rate
o EURIBOR	o Treasury Rate
o Prime Rate	o Other (See Attached)

If LIBOR:o LIBOR Reuters

LIBOR Currency:

If CMT Rate:

Designated Reuters Page:

If FEDCMT:o Weekly Averageo Monthly Average

Designated CMT Maturity Index:

               Index Maturity:

               Spread (+/-):

               Spread Multiplier:

               Interest Reset Date(s):

               Interest Rate Determination Date(s):

               Maximum Interest Rate, if any:

               Minimum Interest Rate, if any:

Calculation of Interest (not applicable unless different than as specified in the prospectus and prospectus supplement):

Day Count Convention (not applicable unless different than as specified in the prospectus and prospectus supplement):

Amortizing Funding Agreement:o Yesþ No. If Yes,

               Amortizing Schedule

               Additional/Other Terms

Discount Funding Agreement:o Yesþ No. If, Yes,

               Total Amount of Discount:

               Initial Accrual Period of Discount:

               Additional/Other Terms:

Redemption Provisions:o Yesþ No. If, Yes,

               Initial Redemption Date:

               Initial Redemption Percentage:

               Annual Redemption Percentage Reduction (if any):

               Redemption:o In whole only and not in part

   o May be in whole or in part

               Additional/Other Terms:

Repayment:o Yesþ No. If, Yes,

               Repayment Date(s):

               Repayment Price:

               Repayment:o In whole only and not in part

  o May be in whole or in part

               Additional/Other Terms:

Sinking Fund (not applicable unless specified):

Additional Amounts to be Paid For Withholding Tax (not applicable unless specified):

Ratings: The Funding Agreement issued under the Program is rated AA by S&P. Principal Life expects the Funding Agreement to be rated Aa2 by Moody’s.

Additional/Other Terms if any:

Special Tax Considerations:

3.The Guarantee

Guarantee Issuer: Principal Financial Group, Inc.

Effective Date: April 25, 2008

Additional/Other Terms if any: