To make abrasion of mutually joined parts suppressible when opening/ closing operation of a gate valve is performed by providing a first drive shaft extended in a valve body and connected to a valve element for opening/closing the opening part of the valve body at one end, a second drive shaft moving in the direction of approaching/separating against the valve body by a drive means, and the like.

When the gate valve is operated in the closing direction, the second drive shaft of a drive body is moved in the direction of approaching to a valve body 13. At this time, a slanted body bearing and a slanted body 3 are also begun to move in the direction of approaching to the valve body 13 while being guided with a guide shaft, but a first drive shaft tiltably journaled with a bearing 8 is also moved in the same direction. When the bearing 8 continues to move and abuts on the bearing stopper in the lower end of the guide shaft, the bearing 8 stops to move. Further when the second drive shaft moves, the slanted body 3 continues to move and slides on the curved face of a roller 6, and the other end side of the first drive shaft 4 extended outside the valve body 13 is moved so as to rotate in the direction shown by the arrow mark 24 centering around a tilting shaft 7.