NOVELTY - A high pressure gas supply system (120) comprises high pressure gas tank (110) in which high pressure gas is stored; gas supply line that extends from high pressure gas tank to gas consuming apparatus; gas supply portion that supplies the high pressure gas inside high pressure gas tank to gas supply line (120P) upon receiving a start signal to start the system so that gas consuming apparatus starts consuming gas; and a preliminary control portion that performs preliminary control that drives gas supply portion before the start signal is received.    USE - As a high pressure gas supply system e.g. fuel cell system (claimed) for vehicle.    ADVANTAGE - When the system is started in a low temperature environment, the function of valve device, such as the pressure decrease valve and the flow control valve, can be maintained or ensured before the system is started, so stable operation is possible from the very beginning of startup in a low temperature environment. Thus, when improving this stability, it is sufficient to only supply gas from the high pressure gas tanks that are already mounted in the fuel cell vehicle, which obviates the need for special equipment to recover the function. With the fuel cell system, the structure is simplified, and cost and weight can be reduced, when stabilizing operation in a low temperature environment. Also, with the fuel cell system, gas inside the tank that naturally rises in temperature when gas is filled into the high pressure gas tank is used for function recovery, so a structure for increasing the temperature of the gas is not necessary.    DETAILED DESCRIPTION - A high pressure gas supply system (120) comprises high pressure gas tank (110) in which high pressure gas is stored; gas supply line that extends from high pressure gas tank to gas consuming apparatus; gas supply portion that supplies the high pressure gas inside high pressure gas tank to gas supply line (120P) upon receiving a start signal to start the system so that gas consuming apparatus starts consuming gas; gas supply functional portion that is arranged in gas supply line downstream of gas supply portion and functions to make an amount of gas that passes through the gas supply line to be consumed by gas consuming apparatus appropriate; and a preliminary control portion that performs preliminary control that drives the gas supply portion before the start signal is received, according to gas temperature inside the high pressure gas tank and an ambient temperature of gas supply line. An INDEPENDENT CLAIM is included for fuel cell system (10) comprising fuel cell (100) and the high pressure gas supply system, where the gas consuming apparatus provided in the high pressure gas supply system is fuel cell, and the high pressure gas tank provided in high pressure gas supply system is tank in which fuel gas that is supplied for electrochemical reaction in the fuel cell is stored.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of fuel cell system.    Fuel cell system (10)    Fuel cell vehicle (20)    Fuel cell (100)    Hydrogen gas supply system (110)    Hydrogen supply line (120P)    Air supply system (140)    Control apparatus (200)    Hydrogen gas station (300)