To provide a slot machine enabling a player to enjoy a sub-game based on switch operation without unnaturally switching performance scenes so as to match the performance scenes with timing of switch operation.

The slot machine includes a symbol combination drawing means, a reel control means, a prize winning processing control means, and a performance control means. Predetermined prescribed performance of a content which has a plurality of optimal operation timing is implemented by the performance control means. While the prescribed performance is being implemented in a state where at least two reels are rotating, optimal operation timing which comes after first reel stop operation and arrives latest is defined as established optimal operation timing when conducting the first reel stop operation and a time difference between subsequent reel stop operation timing and the established optimal operation timing is measured to implement special performance in accordance with the time difference in addition to the prescribed performance.