To prevent a deterioration in decorativeness of a game machine by restricting seeing through of a portion where the decorativeness is spoiled, from the front side of the game machine in the inner structure of the game machine.

In a game board 6, a light emitting decoration unit 700 including a plating base 71, or the like is used as a concealing member for concealing an area except an area, where a variable display device is provided at a rear side of a transparent plate-like member 600, from the front side of the game board 6 to disable seeing through. A performance control means outputs control signals of a performance electric component of a game frame and a light-emitting body of the game board by a serial signal system. A signal line at the frame side is removably connected by one connector. An opening area is formed in the plate-like member and an opening is formed in the concealing member, and a game ball entering the open area from the front side enters the opening, and is guided to the rear side of the concealing member.