To prevent complication of a tank structure when extracting a fuel gas from a high-pressure gas tank and suppressing decrease in temperature of the fuel gas.

A fuel supply device includes: a fuel gas tank storing fuel gas at a high pressure; a temperature detecting means for detecting a temperature in the fuel gas tank; a fuel gas discharge flow path connected to the fuel gas tank; a pilot type valve that is provided in the fuel gas discharge flow path; and a control part. The pilot type valve includes an inlet part into which the fuel gas flows and an outlet part from which the fuel gas flows out, a main valve that is arranged between the inlet part and the outlet part and that opens and closes the fuel gas discharge flow path, a pilot flow path that is provided so as to make the inlet part communicate with the outlet part, a pilot valve that opens and closes the pilot flow path, and an actuator capable of opening and closing the main valve and the pilot valve at different timings. The control part opens only the pilot valve and maintains the closing state of the main valve when the detected temperature detected by the temperature detection means is equal to or lower than a reference temperature.