To constantly and properly keep a supply quantity of rubbish to a crushing device from a feeder with the stable control.

The feeder controlling device is formed from a high level sensor 87a for detecting that the quantity of the rubbish supplied to a jaw-crusher is equal to or above a 1st prescribed quantity a low level sensor 87b for detecting that the quantity of the rubbish supplied to the jaw-crusher 3 is equal to or above a 2nd prescribed quantity smaller than the 1st prescribed quantity and a feeder controlling part provided in a controller 90. The feeder controlling part is for adequately calibrating and changing a driving signal Sf sent from an equipment and instrument controlling part 90b to a solenoid control valve 41 based on the rubbish detecting signal detected in the sensors 87a and 87b to control the working speed of a hydraulic motor 23 for feeder.