To provide a pachinko game machine to conserve resources and simplify an assembly work without impairing a function to prevent returning balls.

The pachinko game machine is provided with an upper tray unit 6 disposed in front of a launching rail 12. A foul ball recovering hole 35 is interposed between the inclined lower end of an external guide tail to guide a launched ball to a game area and the inclined upper end of the launching rail. On the back of the upper tray unit 6 there is provided a returning ball prevention section 55 with a foul ball contact surface, and between the lower end of the returning ball prevention section and the launching rail there is formed an interval through which a game ball can pass, and the foul ball returning from the external guide rail to the launching rail contacts the foul ball contact surface to be prevented from returning to the launching rail and recovered from the foul ball recovering hole.