To provide a method for fixing hammering plate in impact crusher which makes easy replacement of a hammering plate, moreover, even when the hammering plate is curved and there is a gap due to the manufacture error, is excellent in stability (fixture condition) of the hammering plate, has no fear of being brought into local contact and allows prevention of the fatigue of rotor disk and the failure of the hammering plate, and a device therefor.

In the impact crusher, the rotor disk 3 which is made by loading the hammering plates 2 freely attachably and detachably is supported by a rotation shaft in a machine case and a plurality of repulsion plates corresponding to the hammering plates 2 are disposed and loading grooves 6 of the hammering plates 2 are formed at every same open angle on the outer periphery of the rotor disk 3. This method further features that the lower parts of the hammering plates 2 are directly suspended and lowered into the loading grooves 6 from just above of opening parts of the loading grooves 6 which are turned upwardly, thereafter, wedge shaped blocks 7 are inserted between the loading grooves 6 and the hammering plates 2 from a lateral side of the rotor disk 3 and the hammering plates 2 are fixed inside the grooves 6 by the wedge shaped blocks 7.