To solve the problem that a second performance image display means in a conventional Pachislot machine does not contribute to the improvement of a savor of a game at all or only temporarily contributes to it.

When the privilege role of "BB1" or "BB2" is determined as a winning role by a winning symbol combination determination means when a special performance flag is "off", a performance determination table A (Fig.13(a); (not shown in the figure)) for a general game state is referred to, and one performance identifier from "no performance" and "performance A" to "performance F" is determined by drawing corresponding to the winning symbol combination determined by the winning symbol combination determination means (S363, S364). When the performance identifier of "performance F" is determined, the special performance flag is turned "on" (S365, S366), a premium performance is executed, and a special performance image is displayed at a second liquid crystal display device 110 (S368, Fig.22; (not shown in the figure), S305, Fig.26; (not shown in the figure)).