To make it possible to embody an interlock switch function and to keep maintaining a lock state in the adequate pressure positions of levers regardless of the opening and closing order of plural doors in an image forming device.

When the front door is closed, a pressing member pushes links 7a and 7b and releases levers 6a and 6b. When the right door is closed, the pressing member pushes the lever right 6b and pushes the entire part of the lever device 5 to the interlock switch device 4 side. The lever left 6a pushes an actuator 2 and a switch 1 goes on. When one of the doors is closed, the entire part of the lever switch 5 is parted from the interlock switch device 4 by a spring 9 and the switch 1 goes off. A front side plate 122 and the lever left 6a are provided with holes 122b and 6a1. A screw 11, a screw driver 12, etc., are held inserted into the holes 122b and 6a1 in a state such that the respective holes 122b and 6a1 line up perpendicularly, by which the on state of the interlock switch device 4 may be maintained.