A gate valve has a valve rod equipped with a valve plate having a pair of valve plate surfaces, wherein the valve rod is tilted by an actuator to thereby effect highly reliable valve opening/closing operation with a simple construction. In the gate valve, the valve rod, which is equipped with the valve plate with the pair of valve plate surfaces, is rotatably supported, and raised and lowered by a raising/lowering cylinder, the valve rod being tilted by an actuator, a combination of a cam member and a cam raising/lowering cylinder, a combination of a driving block and a cylinder, or a combination of a connection member and a driving device (not shown) to thereby effect valve opening/closing with the pair of valve plate surfaces.