PURPOSE: To decrease the number of parts and to facilitate an assembly work by providing an opening/closing means and a guiding means so that they can be interlocked mechanically and attaching a driving means to one of the opening/closing means or the guiding means.

CONSTITUTION: A variable prize-winning ball device 1 is mainly constituted of a housing part 13 for housing temporarily an emitted ball which is hit out to a playing board 3, an inflow port 14 which can allow the emitted ball to flow in, an opening/ closing means 15 for opening/closing the inflow port 14, a guiding means 16 provided on the opening/closing means 15 so that it can be interlocked mechanically, and a driving means 17 for driving the guiding means 16. The driving means 17 drives the guiding means 16, and the guiding means 16 is slid between a first position in which one end side is allowed to coincide with a straight line for connecting each opening/ closing axis 24, 24 and a second position protruded to a glass plate 18 side from the variable prize-winning ball device 1. When the driving means 17 drives one of the guiding means 16 or the opening/closing means 15, the other is interlocked and driven. The opening/closing means 15 opens/closed the inflow port 14, and the guiding means 16 takes a first position or a second position, therefore, it becomes unnecessary to provide independently the driving means 17 on the guiding means 16 and the opening/ closing means 15.