To provide a crusher which can increase working efficiency by automatically setting driving conditions according to characteristics of a material to be crushed.

The crusher includes: a crushing device 13 for crushing a material W to be crushed; a conveyor 12 for transporting the material W to the crushing device 13; a press roller 24 facing the conveyance surface of the transporting conveyor 12; a press cylinder 29 for pressing the press roller 24 on the material W on the transporting conveyor 12; a calculating section 78 for pressing load, measuring the load of the press cylinder 29 when the press cylinder 29 is driven to press the press roller 24 on the material W a hardness determination section 79 for determining the hardness of the material W from the load of the press cylinder 20; and a changing section 84 for crushing conditions, changing crushing conditions according to the determination result of the hardness determination section 79.