Solenoid valve

A solenoid valve comprising:

• a hollow sleeve formed with ports including an input port, an output port, and a discharge port, a spool that is a shaft-shaped member inserted into an interior of the sleeve and connects and disconnects the respective ports;
• and
• a solenoid portion that moves the spool in an axial direction, wherein
• the spool includes:
• a first spool which forms a feedback chamber, into which an output pressure is introduced, together with the sleeve, and which is capable of regulating an input pressure from the input port and outputting the regulated input pressure to the output port by moving in the axial direction while receiving a feedback force;
• a second spool which is pushed by the solenoid portion and switched so as to introduce the output pressure into the feedback chamber and close the feedback chamber;
• and
• a biasing member which is provided between the first spool and the second spool so as to bias the first spool and the second spool relative to each other, and
• the biasing member is formed such that when the second spool is pushed by the solenoid portion, the first spool is pushed from the second spool via the biasing member so as to move in the axial direction.