Prospectus Supplement Dated December 9, 2005 to          Filed Pursuant to Rule 424(b)(3)
Prospectus Dated August 3, 2005                                       File No. 333-126659



                                   RIVIERA TOOL COMPANY

                             3,782,531 Shares of Common Stock
                                      (No Par Value)

     On December 9, 2005, Riviera Tool Company entered into an Omnibus Amendment
with Laurus Master Fund, Ltd. ("Laurus"), amending the term "Fixed Conversion
Price" with respect to the Convertible Term Note (the "Term Note"), dated as of
May 17, 2005, by Riviera Tool in favor of Laurus in the aggregate principal
amount of $3,200,000 issued pursuant to the terms of the Securities Purchase
Agreement, dated as of May 17, 2005, between Riviera Tool and Laurus. The term
"Fixed Conversion Price," with respect solely to the Term Note, was amended as
follows:

      The  initial  Fixed  Conversion   Price  means  $1.66;   provided,
      however,  that in  respect  of the  first  $150,000  of  aggregate
      principal  amount  (the  "Initial  Converted  Amount") of the Term
      Note  converted  into  shares  of  our  common  stock,  the  Fixed
      Conversion Price in respect of such Initial  Converted Amount (and
      the  interest  and  fees   associated   therewith  to  the  extent
      converted) shall be equal to $0.55.

     For purposes of this prospectus supplement and the related prospectus, any
references to "Fixed Conversion Price" shall be amended as described above.