| 摘要 |
The present invention provides a gas generator including, a housing having a circumferential wall including a gas discharge port, a first end, and a second end, a inner tube member disposed in the housing, an outer space thereof defines a combustion chamber charged with a gas generating agent, an outer circumference cylindrical member provided within the housing such that one end opening abuts against a bottom plate of the second end, an annular porous member provided between the outer circumference cylindrical member and the cup-shaped inner tube member so as to form a space above the combustion chamber, a gas discharge path formed between the outer circumference cylindrical member and an inner wall surface of the circumferential wall portion of the housing; a communicating portion communicating the space and the gas discharge path, and being provided in the other end opening of the outer circumference cylindrical member; and a total cross-sectional area (A1) of the gas discharge port being smaller than a smallest cross-sectional area (A2) of a gas pathway (A1<A2).
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