PURPOSE: To suppress the obstruction of the flow of pachinko (pinball game) balls resulted from magnetization by making a demagnetizing device face one pachinko ball passage of either a circulation guide device or a ball supplying device to demagnetize the magnetism charged on pachinko balls.

CONSTITUTION: A demagnetizing device 17 is made to face one pachinko ball passage of either a circulation guide device 5 or a ball supplying device 16 to demagnetize the magnetism charged on pachinko balls. Otherwise, a polishing device for polishing pachinko balls is provided in the course of the circulation guide device 5, for example, near the inflow port of a waiting gutter 12, and the demagnetizing device 17 is provided in the preprocess or post-process of the polishing device. Since the mutual attraction of pachinko balls by the residual magnetism or the attraction of the inner wall of the constituting member of a circulating passage with the pachinko balls by the residual magnetism is prevented, the pachinko balls can be smoothly circulated in the circulating passage.