To perform appropriate processing even if occurring an error when controlling the rotation and stop of performance reels independently from game reels.

This slot machine is provided with a main control means 60a controlling the progress of a game including the control of the start and the stop of a group of first reels 31 displaying the result of the game; a sub control means 60b controlling the output of the performance in the game including the control of the start and the stop of a group of second reels 51 performing the game; and an error detecting means 71 detecting the error. The sub control means 60b is provided with error information output control means, when detecting the error, controlling to output error information and, when the stop control of the second reels 51 is not finished yet in detecting the error, controlling to wait the output of the error information till finishing the stop control of the second reels 51 in the game.