An object of the present invention is to provide a hydrogen gas supply device including a pressure regulating valve capable of controlling the flow rate (or pressure) of hydrogen to the fuel cell stack with a high degree of accuracy even if upstream pressu...

A main valve body 10 is provided in a housing 3 included in a solenoid on-off valve 1. A pilot passage 18 is formed on the main valve body 10, and a pilot valve body 11 is inserted into the pilot passage 18 so as to open and close the pilot passage 18. The...