To provide a garbage crusher resolving any problem of anomaly caused by biting of rotary blades and by vibration of the crusher.

In this garbage crusher 12, a rotation speed of a motor 42 and a current value are monitored. When the rotation speed is less than a lower limit speed and the current value is less than a reference value, biting anomaly is determined and biting release mode operation is performed. When the current value is higher than the reference value, vibration anomaly is determined, and vibration release mode operation is performed.