To improve the visual recognizability of the special performance device while enhancing the handleability of the reel unit and the game performance device in a slot machine in which the game performance device is mounted on the reel unit and the reel unit and the game performance device are detachably mounted on the cabinet integrally.

The slot machine 1 has the cabinet 2 having an opening part 21 on the front thereof, a door 3 for opening or closing the opening part 21, the reel unit 4 which is detachably mounted in the cabinet 2 and variably displays the figures with a plurality of rotary reels 41, 42 and 43 and the game performance device 5 which is provided within the cabinet 2 and carries out the visual performance of the games in the fashion different from that of the reel unit 4. The game performance device 5 is mounted on the side part of the reel unit 4 and detachably mounted on the cabinet 2 by integration with the reel unit 4.