



                                                                 EXHIBIT 5



                            FACSIMILE (513) 579-6956

                                 March 24, 1999

Direct Dial: (513) 579-6411

Cintas Corporation
6800 Cintas Boulevard
P.O. Box 625737
Cincinnati, Ohio 45262-5737

Gentlemen:

     We serve as your  general  counsel and are familiar  with your  Articles of
Incorporation,  Bylaws and corporate proceedings generally. We have reviewed the
corporate  records as to the Unitog  Company 1992 Stock Option Plan, as amended,
and the Unitog  Company 1997 Stock Option Plan as well as the Agreement and Plan
of Merger by and among Cintas, Cintas Image Acquisition Company and Unitog dated
January 9, 1999 and  documents  relating  thereto which call for the issuance of
shares of Cintas Common Stock to option holders of Unitog Company.  Based solely
upon such examination and considerations, we are of the opinion:

     1.  That  Cintas  Corporation  is a duly  organized  and  validly  existing
corporation under the laws of Washington; and

     2. That Cintas has taken all  necessary and required  corporate  actions in
connection  with the proposed  issuance of up to 191,627 shares of Cintas Common
Stock  pursuant  to these  Plans and the Cintas  Common  Stock,  when issued and
delivered,  will be  validly  issued,  fully paid and  non-assessable  shares of
Common Stock of the Corporation free of any claim of pre-emptive rights.

     We  hereby  consent  to be  named  in the  Registration  Statement  and the
Prospectus  part thereof as the  attorneys who have passed upon legal matters in
connection with the issuance of the aforesaid  Common Stock and to the filing of
this opinion as an exhibit to the Registration Statement.

                                            Very truly yours,

                                            KEATING, MUETHING & KLEKAMP, P.L.L.


                                            BY: /s/ Gary P. Kreider
                                               ------------------------------
                                                    Gary P. Kreider


