To provide a game machine capable of minutely and easily setting and changing the advantageous degree of every game machine.

This game machine is provided with a starting port 50 having a condition device 51 such as a movable piece for changing the state of a prize winning port into a closed state hard for a ball to win a prize and an open state easy for the ball to win the prize. The length of an open period and opening/closing frequency when opening the condition device 51 of the starting port on the basis of the establishment of a specified game condition are set and changed through a setting switch 230.