To provide a slot machine for playing a game by a new line belt.

On the liquid crystal display device 30 of the slot machine 10, a plurality of circumferential line belts 3a-3d composed of the concentric circles of different radii and symbols 90-94 are displayed. A controller 100 performs the control of determining a sectorial area centering on the center of the concentric circles as an effective area 7 and displaying the effective area in a color different from the one of the other area. The controller 100 performs the control of rotationally displaying and stop-displaying the displayed circumferential line belts 3a-3d and the effective area 7, and imparts a prescribed dividend to a player on condition that a prescribed symbol is stop-displayed in the effective area 7.