MULTI-STAGE EXPANSION TYPE HYBRID INFLATOR

A hybrid inflator having further improved inflating performance of an air bag is provided. A gas generator in a hosing 102 in which a pressurized medium is charged under a high pressure includes a first gas generating chamber 120 and a second gas generating chamber 130. By allowing the two gas generating chambers to generate high-temperature combustion gas respectively, the inflating speed and the like of the air bag are further improved.