To provide a slot machine capable of giving a big expectation and satisfaction to players by raising reliability on multiple times of discharge of winning prize flag.

When an RB2 winning prize is won by lottery after an operation to start a game, an RB2 flag showing this internal winning status is accumulated. If five or more RB2 flags are accumulated, a lottery for starting discharge is enforced, and discharge of RB2 flag is initiated with a qualification that the lottery is won. At this time, "5" is established as an initial value of discharge remainder n, and the RB2 flags corresponding to the discharge number are discharged sequentially. When five or more RB2 flags are still accumulated even after discharge, lottery for reconfiguration is enforced, and if this lottery is won, the discharge remainder n is reset to "5" of the initial value.