A game device is a turn-table adapter having a clip mountable on a case, a
shaft passing through one arm of the clip, an operation disk coaxially
provided to the shaft at one end thereof, and a press-in disk coaxially
provided to the shaft at another end thereof. Another arm of the clip is
optionally provided with a bump to be fitted to a hole formed on the case
to serve as an element necessary for assembling the game device. A bottom
surface of the press-in disk opposite to a press-switch is formed with a
bump which engages the press-switch to thereby depress the press-switch.