During a slot machine game, game effects are also displayed on a liquid crystal panel 39d provided in a reel display window unit 39, and thus the liquid crystal panel 39d serves as a new machine component for performing game effects. Therefore, new effects for the game can be performed on the liquid crystal panel 39d, which facilitates maintaining the novelty of game effects. Furthermore, since the reel glass base 39b is black-colored, any light incident on the reel glass base 39b is not easy to be reflected on the liquid crystal panel 39d. Consequently no light incident on the reel glass base 39b is mirrored into the liquid crystal panel 39d.