PURPOSE: To efficiently replace sealed balls in a sealed ball type game machine.

CONSTITUTION: In a sealed ball type game machine in which a prescribed number of game balls are sealed in such a manner as to be capable of circulating, and the game balls are successively shot to a game area by a shooting device to play a game, this machine has a sealed ball circulating mechanism for circulating the game balls, and game ball supply parts 58, 58a for supplying game balls into the sealed ball circulating mechanism are formed in the course of the sealed ball circulating mechanism.