PURPOSE: To provide the game machine which can execute an operation conforming to a business policy due to a fact that a base value in an actual game approaches a reference base value set in advance, and can balance easily profits of a game store and profits of a player.

CONSTITUTION: The inside of a game part is provided with a specific prize- winning port 8, an ordinary picture pattern display device 10 for executing a variable display by prize-winning to the specific prize-winning port, a first fluctuation prize-winning device 7 converted to a second state that a hit ball goes in easily, when a prize state is formed by the ordinary picture pattern display device, a special picture pattern display device 6 for executing a variable display by prize-winning to a first fluctuation prize-winning device, and a second fluctuation prize-winning device 9 converted to a second state that a hit ball goes in easily, when a prize state is formed by the special picture pattern display device. Also, an electrical controller for comparing a reference base value and an actual base value and varying a second state time of a first fluctuation prize-winning device is provided.