To surely protect getting stuck with an object entering or leaving there, damaging an actuator, or the like.

The actuator 4 is mounted on a sliding member 5' and is slidable on a guide means 8'. On a flange 5c' of the sliding member 5' guided by the guide means 8'; an inclined plane 5g is formed from the front side of the flange 5c', and a shoulder 5f is formed at a transition point from the inclined plane 5g to a flat plane 5h of the rear side of the flange 5c'. This can prevent the sliding member 5' from an undesired protrusion due to vibration or shock. After a door 2 is closed, an operator pushes the sliding member 5' in a direction of an arrow head F11 so as to let a rear end face 8f climb over the shoulder 5f, and then the operator slides the sliding member 5' in a direction of an arrow head F12 so as to penetrate an operating piece 4a into a slot 7a and to rotate a cam, whereby the switch can be turned on.

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