To provide a wood processing cutter for which the replacement of cutters can be carried out inexpensively and a plurality of kinds of cutters can be installed to one back washer.

A back washer 3 is stored in a recessed channel 2 formed on the peripheral section of a base metal 1, and a cutter 4 is set removably by a fitting component 5 on a setting step section 8 formed on the other side of the back washer 3, and a fixing means 6, screwed into a screw hole 20 formed on the base metal 1, being brought into contact with the other side of the cutter 4 or the back washer 3 and pressing the back washer 3 to one side wall of the recessed channel 2 and fixing the back washer thereon, is provided on the back washer 3.