To provide a game machine which prevents players from suffering disadvantage against their will in a type which carries out a lottery processing varying the contents of lottery according to a plurality of start pockets.

Expected values of game balls which are imparted when the jackpot is shown as the result of the determination on win or loss by the second special symbol win/loss-determining means 914 are set higher than those which are imparted when the jackpot is shown as the result of the determination made by the first special symbol win/loss-determining means 904 on it. At this point, when it is determined that a door frame 5 is opened while the varied probability function is performed, despite a determination already given that the game balls win the first start pocket 600, the lottery processing by the first special symbol lottery means 900 is eliminated, thereby keeping the players from suffering disadvantage otherwise caused against their will.