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


I, Ralph C. Eucher,  President of Principal  Cash  Management  Fund Fund,  Inc.,
certify  that (i) the Form  N-CSR for the  period  ended  April 30,  2003  fully
complies  with the  requirements  of  Section  13(a) or 15(d) of the  Securities
Exchange  Act of 1934 and (ii) the  information  contained in the Form N-CSR for
the period ended April 30, 2003 fairly presents,  in all material respects,  the
financial  condition and results of operations of Principal Cash Management Fund
Fund, Inc.


Date: June 19, 2003                     /s/ Ralph C. Eucher
                                    -------------------------------
                                    Ralph C. Eucher
                                    President


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




I, Jill R. Brown,  Vice President and Chief Financial  Officer of Principal Cash
Management Fund Fund, Inc., certify that (i) the Form N-CSR for the period ended
April 30, 2003 fully complies with the requirements of Section 13(a) or 15(d) of
the Securities  Exchange Act of 1934 and (ii) the  information  contained in the
Form N-CSR for the period ended April 30, 2003 fairly presents,  in all material
respects,  the financial  condition and results of operations of Principal  Cash
Management Fund Fund, Inc.


Date: June 19, 2003                     /s/ Jill R. Brown
                                    -------------------------------
                                    Jill R. Brown
                                    Vice President and Chief Financial Officer