PURPOSE: To improve appearance and to make installation possible irrespective of the height of ceiling of the game room.

CONSTITUTION: As a polishing tube 11 and an upward transfer tube 31 are formed independently, a space for equipping a driving motor 36 for the second spiral 35 can be secured at the lower end of the transfer tube 31, eliminating the necessity to equip the driving motor 36 for the second spiral at the upper end of such tube 31. Further, the driving motor 36 for the second spiral does not protrude substantially above the pachinko island and, as it is not necessary to extend the upper end of the polishing tube 11 to the height of the pachinko island even when a motor for driving the first spiral 15 in the polishing tube 11 is equipped at the upper end of the polishing tube 11, the motor for driving the first spiral 15 does not protrude above the pachinko island either.