PURPOSE: To regenerate a polishing agent for polishing pachinko balls used by Japanese pinball game (pachinko) by integrating a pachinko ball polishing unit and a polishing agent regenerator.

CONSTITUTION: A polishing agent regenerator is provided integrally on the side of an outlet 4 of a pachinko ball polishing unit 2 to polish pachinko balls 15 using a screw feeder 6. The polishing agent regenerator is linked successively to the pachinko ball polishing unit 2 through a partition for separating a polishing agent from pachinko balls. The polishing agent regenerator has a polishing agent - polish chamber and a polishing dust housing chamber being divided inside with a seive plate and an agitation member 19 which is driven to rotate with a rotating shaft of the screw feeder 6 is arranged in the polishing - agent polish chamber.