A gas generator for an air bag includes a filter having excellent cooling effect. A gas flow as illustrated in the drawings is formed by effect of the inner cylindrical shielding plate 66, the outer cylindrical shielding plate 67, the first gap 71 and the second gap 72, which sandwich a cylindrical filter 65 for cooling a combustion gas from the both side. Thus, the cooling effect of the combustion gas is enhanced.

 
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