Tank charging for charging the fuel gas (G) in a 100 sphere 6 and the tank and the valve body (5) having an output port 7 for outputting the fuel gas (G) in the 100, the charging obtain ( 6) the fuel gas to be filled in (G) a having the classification deflection piece (10) for ejecting inclined a predetermined angle with respect to the axial direction of the tank 100, and classification biasing piece 10 is a tank for the fuel gas (G) ( fuel spout (17 having an outlet 11 for ejection in a 100)), a tank temperature sensor 20, a temperature measuring section (13 is arranged to measure the temperature of the fuel gas (G) filled in 100) for it is provided, it is to allow the fuel gas temperature in the fuel tank when filling the fuel to be accurately measured and monitored.