A fixing structure for solenoid (10) includes a valve body (50) including a tubular valve insertion portion (51), a solenoid (10) to be inserted into the valve insertion portion (51), a cover (60) to cover the valve body (50) in a direction intersecting an inserting direction of the solenoid (10) into the valve insertion portion (51), and a pin (40) to be inserted and pierced through the valve insertion portion (51) and the solenoid (10) from the side of the cover (60), thereby restricting detachment of the solenoid (10) from the valve insertion portion (51). The cover (60) includes a resilient pressing piece (61) to be pressed against the pin (40) and resiliently deformed when inserting the pin (40) and to hold an inserted state of the pin (40) by resiliently returning and pressing an end of the pin (40) when the insertion of the pin (40) is completed.