The subject innovation is therefore to be processed is pulverized while smoothly passing without congestion therein, improvement in the productivity of the products, as well, not the overload is not generated like the motor, according to the grinding apparatus to adjust easily the grinding size of the object treated will be. According to the present invention, is provided with a input hopper 15 to the upper lower side with an outlet (17) provided with a housing 10, is vertically mounted in the interior of the housing 10, a shaft rotation is connected to motor 60 and 65 and is disposed in a ring shape along the inner wall surface of the housing 10. the vertical inner side surface there is target object is falling injected falling ball 33. the guide member 30 is formed at a predetermined interval, is horizontally installed on the shaft 65, the disc portion 41 of a circumference of the plurality of cutters 45 extending in the radial direction provided in the rotary blade members 40 to block the hollow portion of the ring-shaped guide member 30 and including, the crushing device, it characterized in that the to be crushed by the cutter 45 is provided as inputted target object is dropped through the drop hole 33 of the guide member 30.