To provide a slot machine which can facilitate the change of machine kinds or the like and has a high security.

In the slot machine comprising a box body housing various kinds of devices for executing a game, a reel unit 70 for rotatably supporting a plurality of reels 3L, 3C and 3R installed inside the box body for variably displaying two or more kinds of identification information, and a control board 100 for controlling a game processing operation, the control board 100 is detachably mounted on the reel unit 70 and a first locking means 80 for integrally attaching and locking the reel unit 70 and the control board 100 so as not to be detached is provided.