To enhance the interest in game, and to facilitate the lay-out of a cage of a game board even when a display device has an increased size.

An attachment base board 1 adapted to be attached to a game board, is formed in its front surface with a ball inlet passage 4a for receiving a shot Pachinko ball and a shot ball outlet passage 4b connected to the lower end part of the inlet passage 4a and inclined upward at a desired angle, and a hammer piece 8 which is reciprocally rotated by a suitable driving means is arranged confronting the shot ball outlet passage 4b so that a game ball running through the shot ball outlet passage 4b is shot outward obliquely upward.