To provide a game machine that requires higher contingency than before, for entering a game ball a start winning port, an ability of inferencing which position of a top pin game balls are to be hit, and a shooting technique for precisely shooting the game balls which complements the ability of inference, and thus has enhanced entertainment of a game.

Start prize winning ports 20A to 20C are formed by arch-shaped encircling bodies 21 and prize winning ports 22 which are provided inside the encircling bodies 21 and are open below the encircling bodies 21, and include a pair of guide bodies 23 which are provided outside and below the encircling bodies 21 and on both sides of a passage where game balls pass below the prize winning ports 22, and which guide to the prize winning ports 22 game balls falling right and left of the passage.