To provide a crusher which is easy to dismantle and assemble, is constituted so as to perform the cleaning of a blade part easily and reliably, allows sanitary processing and, further, allows a variety of crushing to be performed.

A disklike rotation blade 6 rotating with a rotation driving means is included, an impeller part 9 which is positioned on the outer peripheral part around a rotation axis X-X of a base plate part 8 and extrudes raw material to the outer peripheral direction is projectingly disposed on the surface of the base plate part 8 of the rotation blade 6, further, many rotating blade parts 10 which are positioned on the outer peripheral part of the impeller part 9 are projectingly disposed at a proper interval over the whole periphery around the rotation axis X-X and the base plate part 8, the impeller part 9 and the rotating blade parts 10 are integrally formed. Furthermore, a fixed blade body 15 is disposed on the upper part of the rotation blade 6 in such a manner that a fixed blade part 18 formed on the fixed blade body 15 gets near to the side surface in the radial direction of the rotating blade parts 10.