{Technical Problem}To provide a gate valve that can control the amount of squeeze of sealing material according to each of situations, that is, under the in-manufacturing or during vacuum-maintaining state; thereby, the invented gate valve is capable of suppressing deterioration of its sealing material and lengthening the service life of the sealing material used therein.{Solution to Problem}The gate valve 100 of the embodiment has the control device 11, which is comprised of the equipment control unit 12 that transmits an instruction either an in-manufacturing CLOSE instruction or a FULL CLOSE instruction and the storage means 13 that stores position date that corresponds to each of such instructions. The control device 11 receives either of such instructions and generates the position signal referring to the corresponding position data. The servo motor 4 of the driving device 2 receives the position signal and the rotative force of the servo motor 4, which corresponds to the received position signal, is translated into the movement of the activator 5. The sealing material 3 on the gate 1 is pressed against the valve seat 101 by the gate 1 driven according to each of the instructions and is maintained in the squeezed state.