To bring only a liquid crystal television or the like into movable state and to prevent a work table or cart other than the television from being moved together when moving this liquid crystal television or the like.

All joints 42 and 43 or the like are composed of air brakes or electromagnetic brakes, and ordinarily, these joints can not be relatively displaced between adjacent arms. When a handle 5 is grasped on the assumption it is wanted to move a display device 1 to a desired position or when the handle 5 or manipulation switch provided closely to this handle 5 is pressed, the air brake or electromagnetic brake only of the joint required for moving this display device 1 is canceled and the brake of the joint required for moving a work table 11 is not canceled.