SOLENOID VALVE

The present invention improves the operation accuracy of the solenoid valve. A solenoid valve includes an inlet port into which a fluid flows, an outlet port from which a fluid flows, a seal member arranged in a channel of a fluid between the inlet port and the outlet port and having an opening, a valve body configured to open and close the opening of the seal member to open and close the channel, a first spring configured to bias the valve body against the seal member so as to close the opening of the seal member, electromagnetic driving means, including an umbrella-shaped movable core configured to move the valve body and an electromagnetic coil configured to attract the umbrella-shaped movable core, for operating by being energized by the electromagnetic coil so as to open the opening of the seal member by attracting the umbrella-shaped movable core and separating the valve body from the opening, and a second spring configured to exert, on the umbrella-shaped movable core, a spring force weaker than a spring force of the first spring in a direction opposite to a biasing direction of the first spring, wherein the second spring is provided with rotation preventing means for preventing the umbrella-shaped movable core from rotating with respect to the electromagnetic coil.