A solenoid valve includes a main valve unit including a spool for switching a channel, and a solenoid operating unit for driving the spool, the main valve unit includes manual buttons capable of manually switching the spool, and a safety member movably disposed, and this safety member can be moved between a locking position for locking the manual buttons in an inoperative state by locking the safety member in the manual buttons and an unlocking position for unlocking the lock by disengaging the safety member from the manual buttons.