PURPOSE: To sterilize an used injector within a short time, cut the injector after sterilization, and conduct the sterilization to the cutting in a series of processes.

CONSTITUTION: In an oven 1, injectors 3 inputted from a hopper 2 are superposed sideways so that the injectors 3 in the oven are exposed to the microwave generated from a magnetron. The floor 7 of the oven 1 can be opened and closed, a crushing chamber 8 is provided below it, and comb-tooth edges 9 arranged on both sides thereof are advanced by the operation of hydraulic cylinders 11, respectively, to cut the injectors after sterilization fallen into the crushing chamber 8 from the oven 1. The cut injectors 3 are eliminated by opening the floor 13 of the crushing chamber 8.