To provide a game machine which realizes desired security operation without interfering with its original performance control operation.

A main controller 21 for executing a game control operation comprises: a one-chip microcomputer 21A internally comprises a ROM, a RAM, a random number generation circuit GNR, and a CPU. The random number generation circuit GNR comprises: a counter circuit 42 which circulates within a predetermined numerical range; plural holding circuits LRi which store a random number value based on an output from the counter circuit, in response to a change in a switch signal to a predetermined direction; and a single determination circuit DJ which compares the random number stored in the holding circuits with a preset lottery value and stores a comparison result.