To increase the switching performance of a solenoid valve by reducing noise on impact and preventing a suction force from lowering.

This solenoid valve 1 comprises: a fixed steel core 2, a solenoid coil 3 installed around the fixed steel core; a movable steel core 4 moved by the sucking force of the fixed steel core and the solenoid coil; and a valve part 5 formed so as to control the flow of fluid by the movable steel core. A plate spring member 31 formed of a magnetic body is installed between the fixed steel core and the movable steel core, and the plate spring member is formed to have a spring force to separate the fixed steel core from the movable steel core in the thickness direction of the plate spring member. Also, the plate spring member is formed in a generally disk shape having a center part 32 and an outer peripheral part 33, and a step 34 is provided between the center part and the outer peripheral part.