To surely detect the number of pachinko balls discharged from an outlet of a ball passage with a simple structure.

When pachinko balls 8 rise in a ball passage 11, a first ball sensor 58 detects the pachinko balls 8, and a main controller executes the addition to a shot ball counter. In this case, a second ball sensor 54 is actuated only for a specific time, so that it detects the pachinko balls 8 when the pachinko balls 8 are collided with a ball returning prevention plate 18 and dropped in the ball passage 11, and the main controller executes the addition to a returned ball counter. By subtracting a value of the returned ball counter from a value of the shot ball counter, the number of pachinko balls 8 actually discharged through the ball returning prevention plate 18 can be detected.