PURPOSE: To distinguish definitely lifting-lowering operation and from slanting one to prevent mis-operation and ensure safety.

CONSTITUTION: A remote control box 32 is provided on its control board 32a with a first switch 34 and on its side 32b leading out a cord 33 with a second switch 35 separately. The first switch 34 constituted from a neutral position returning system seesaw type switch is used both for lifting-lowering and slanting a damp door. Also, the second switch 35 constituted from a spring return system push button type change-over switch is used for changing over the operation of the first switch 34 to the lifting-lowering and slanting operations of the damp door. The door is lifted, lowered or slanted as long as the first switch 34 is operated and can be slanted as long as the second switch 35 is operated. Furthermore, simultaneous operations of the switches 34, 35 need to be carried out by both hands.