Abstract: The arched lamp case for a game machine is provided with a lamp frame in the shape of an arched frame, a lot of LED′ are mounted thereon, and is provided with a changeable external frame member of which the inner side can be fixedly connected to the lamp frame, a transparent internal lining frame member is provided between the external frame member and the lamp frame. The LED's can be exposed via through holes provided on the external frame member, and can flash in pursuance of digital signals generated according to the kinds of rewards of games or in pursuance of analog signals of sounds. Thereby, acoustic and video effects can be increased when the lamp case is installed on a game machine.