To more compactly dispose a reel unit and a circuit board.

In a slot machine 20 using game balls, a subordinate control board 50 is disposed along the upper surface of the reel unit 90 so that the subordinate control board is held on the front side of the slot machine 20 from the back face of the reel unit 90 and so that the electronic component face is the upper side. By disposing the subordinate control board in this way, the space formed in the upper, lower, left and right sides of the reel unit 90 projecting toward the back face of the slot machine 20 can be effectively utilized, and the electronic component face of the subordinate board can be easily visually recognized. In addition, as an inclined face is formed on the upper part of the back face of a reel case 91, the rear side of the subordinate board 50 can be visually recognized from the space formed by the inclined face. As a result, the reel unit and the circuit board can be more compactly disposed.

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