Sliding door device

The sliding door device, the frame of the present invention (6) is vertically erected on the floor (3), will be opened and closed by the frame (6) with the ground (3) gate (4) composed of a door (5 ) arranged along the frame (6) of the facade is movable in the horizontal direction. Light projector (10), so that the lower end of the door-side vertical frame side emitting vertical gaps between the facing vertical frame (1) and the door (5) protrude, facing the door is provided on the vertical frame (1), (5) a. Optical receiver (9), the light (L1) in order to accept the light projector (10) emitted the incident surface and the upper frame (2) below (2b) in the flush position, and is disposed on the frame (2 )on. It is possible to provide a door and door gap into a dark box housed in the preventive measures to stop the like, while the cargo, and the like can be suppressed for detecting the access door and cargo door accommodating gap dark box and the light emitter generating sliding injury gate means.