To provide a structure of a slot unit strong against dishonesty, for turning the slot of a separation type slot machine into a unit, improving operability of a player and exchangeability of machine kind changeover or the like, shortening the leading of wiring by housing electrical wiring relating to main game control inside the slot unit altogether and enabling the independent exchange of the slot unit.

In the separation type slot machine composed of the slot unit and a case body, the slot unit is constituted by turning a drum device or a liquid crystal type pattern display device, a game control circuit, a game operation switch and a medal feeder into the unit. The slot unit can be independently exchanged even in the case of a fault or the like without damaging the operability of the player operating the slot unit, it is strong against the dishonesty, and the exchangeability of the machine kind changeover or the like is improved as well.