To provide a game machine capable of preventing dishonest actions targeting random number updating processing.

A pachinko game machine (10) updates a random number counter at a prescribed time interval. The pachinko game machine (10) detects that a game ball passes through a start area provided in a game area and extracts a random number value from the random number counter as the result. The pachinko game machine (10) shifts to a specified game state advantageous to a player on the basis of the extracted random number value. The processing of updating the random number counter in the pachinko game machine (10) is allocated to the interrupt processing of the highest priority order by every shortest time interval among two or more kinds of the interrupt processing executed at each of two or more kinds of time intervals.