Gas filling device

The air filling device (1) has pressure regulators (21,22) connected to an air compressor (10). Two air chucks (31,32) are fitted to the tire valves of front and rear tires, respectively and connected to the pressure regulators. Each air chuck permits air to be supplied to the connected tires so that the pressure of the tire becomes the target pressure set by the corresponding pressure regulator. Each pressure regulator sets the pressure of air supplied from the air compressor to a predetermined target pressure.