A gaming machine includes a gaming operation execution device, a loading device and a processing device. The gaming operation execution device executes gaming operations. The loading device includes a connector for connecting a storage medium, a first program memory part for storing a first authentication program, a second program memory part for storing a second authentication program, and a first processor for authenticating the first authentication program with the second authentication program. The processing device includes a memory, a reading unit for reading out the gaming information from the storage medium and for reading out the first authentication program authenticated by the first processor, a second processor for authenticating the gaming information with the authenticated first authentication program, a writing unit for writing the authenticated gaming information to the memory, and an operation control unit for controlling the gaming operation execution device.