To provide a more interesting game machine without alienating the concentration of a player on a game by reporting the state of easily generating a prescribed winning form to the player by the combination of symbol marks.

On the front surface part of a cabinet 2 for forming the whole of the main body 1 of a slot machine, display windows 3L, 3C and 3R for observing the symbol marks of plural reels provided inside the cabinet 2 are provided corresponding to the number of the reels. Also, a winning line is displayed on the display windows 3L, 3C and 3R and the winning form is decided by the combination of the symbol marks arranged on the winning line. Then, the combination of the symbol marks is changed between an S/B high probability state and a normal state and the player recognizes the S/B high probability state in the state of carefully looking at the display windows.