To provide a game machine suitable for preventing a fraudulent action without increasing the difficulty level of development and design and a data capacity.

A main control part 200 of a Pachinko game machine includes a CPU 202 and an access controller 230. The CPU 202 includes a CPU core 203 and an I/F 212, and the CPU core 203 executes the processing of adding an instruction code string executed by the CPU core 203 and the address to a jackpot command and outputting them through the I/F 212. The access controller 230 includes registers 234 and 236, an input part 231 for inputting the instruction code string and the address from the I/F 212, and an access control part 238 for controlling access to the registers 234 and 236 by the CPU 202 on the basis of the instruction code string and the address inputted in the input part 231.