To provide a slot machine capable of improving entertainment of a game in a specified state by making advantage degrees to a player when a prescribed condition is established differ from one another according to a progress status of the game in the specified state.

In the slot machine which executes a battle performance between friend characters and enemy characters and imparts a controlling navigation stock to an AT as a privilege when the player wins the battle performance, the slot machine suggests expectation that the friend characters may win in the battle performance by using points of the friend characters and the enemy characters updated through a plurality of stages during the battle performance, and imparts the navigation stock so that a rate of the advantage degree to the player may be raised at a ratio at which the case of large reversal winning after being updated to the lowest expectation during the battle performance is higher in rate than the case of normal winning.