PURPOSE: To hoist balls with high efficiency into an upper tank so that the height of a pachinko island does not become large and effectively polish the balls in the lower part of a pachinko island.

CONSTITUTION: In the upper part of a pachinko island, ball feeding troughs 2a and 2b for supplying balls to each pachinko game machine (a) from an upper part tank 1 are arranged, and in the lower part, the grooves 3a and 3b for recovering miss balls from each pachinko game machine (a) are arranged. At the intermediate part of the pachinko island, a hoisting lift B whose upper part passes through the upper part tank 1 and hoists the balls, separating only the polishing members, is erected. At least conveyors 4a and 4b which can transport the polishing members are installed in both the grooves 3a and 3b which are extended so that the balls can be transported to both the edge sides of the island A from both the sides of the hoisting lift B, and under both the grooves 3a and 3b, both the polishing machines 5a and 5b which pass through the terminal edge sides of both the grooves 3a and 3b and can transport the balls after the polishing by the polishing members to the lower part of the hoisting lift B are horizontally arranged.