To provided an automatic gas filling apparatus which can be easily mounted later to an existing wheel and also can hold the air pressure of a tire at a predetermined pressure.

This automatic gas filling apparatus comprises a high-pressure gas storage part 3, which is mounted along a belt body 2 and can be filled with a high-pressure air in its interior, and a gas filling means 4 which is mounted on a part of the belt body 2 and can fill the high-pressure gas stored in the high-pressure gas storage part 3 into the tire mounted on a wheel at a specified pressure. Connectors 7, 8 are mounted on both ends of the belt body 2. The belt body 2 is wound around the rim of the wheel utilizing the connectors 7, 8, whereby the automatic gas filling apparatus for automatically regulating the gas pressure in the tire can be mounted later.

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