PURPOSE: To easily attach and detach a rotary disk, especially, to and from a driving shaft of a hopper motor, with regard to the hopper device used for a medal game machine such as a slot machine, etc., for using a medal.

CONSTITUTION: In a driving shaft 51 of a hopper motor 50, a connecting device 60 which can vary the insertion amount of the driving shaft 51 which is fixed so as to be movable in its axial direction, engaged with a bearing part 44 of a rotary disk 40, and inserted into its shaft hole 43 is provided, and between the bearing part 44 of the rotary disk 40 and the connecting device 60, one of rugged parts 45, 62 fitted to each other is provided, respectively.