Abstract: A crusher of the type having a vertical rotary shaft which has a horizontal rotor secured thereto at its upper end and is rotatively mounted within the rotor frame, and mounted on the rotor is a hollow rotary cylinder with an open top end and a closed bottom, the cylinder having its peripheral wall formed with a number of raw material ejection slots so as to eject therethrough by centrifugal force the raw material to be crushed fed into it, and the rotor is further provided with a number of striking members outside the hollow rotary cylinder, preferably respectively pivoted to the rotor, for the purpose of striking the raw material ejected out of the raw material ejection slots of the hollow rotary cylinder, during the course of the flight thereof through the space around the rotary cylinder, whereby the raw material is crushed by the striking members.