To prevent variations in a start prize-winning rate by a simple structure, in a game machine which generates a special game state advantageous to a player, when a variation display game is performed by multiple pieces of identification information on the basis that a game ball enters a start prize-winning port provided in a game region formed on a front face of a game board, and if the variation display game results in a predetermined specific result mode.

A center case 40 includes: a stage 211 which is provided at the bottom face in a concave space backward than the game region 32 and on which a game ball can roll; a warp flow path 55 which introduces the game ball flowing in the game region 32 to the stage 211; and a flowing-in inhibition member 240 which is positioned above the stage 211, projects to the game region 32, and inhibits the game ball leaped up in the game region 32 below the stage 211 from flowing in the stage 211.