A video monitor 13 is provided on the front surface of a game apparatus casing 2. An operation panel 11 is provided immediately below the video monitor 13. Light detection units 15 for detecting a position provided on both side of the upper end. In the game apparatus casing below the video monitor 13 there are provided a game processing board 10 for generally controlling the game apparatus, an operation device control board 16 for controlling maraca-shaped operation device 20 operated by a game player, and a position detecting board 17 for detecting a position of the operation device 20. The game apparatus enables a game player to operate operation device by natural motions without directly operating the operation device, etc.