To provide a performance device in which a height position of a decorating body can be accurately adjusted, and to provide a game machine including the same.

One end side in the long direction of a first Yakumono (accessory) 100 is turnably journaled by a shaft part 110. A cam 183 of a gear 180 normally and reversely rotatable by an upper drive motor 190 can come into contact with a cam reception part 104 provided in the first Yakumono 100 from below. The cam 183 can be displaced between a first cam position wherein the cam reception part 104 is supported by a maximum diameter part 184 and a second cam position wherein the cam reception part 104 falls from the maximum diameter part 184 along a level difference part 186, The first Yakumono 100 is held in an ascent position when the cam 183 is positioned in the first cam position, and is held in a descent position when the cam 183 is positioned in the second cam position.