| 摘要 |
The present invention provides a gas generator including: a housing having a gas discharge port and a first combustion chamber defined in the housing charged with a first gas generating agent, an ignition chamber cup defining an ignition chamber and a second combustion chamber cup defining a second combustion chamber being aligned at a distance in the radial direction, a first communication hole for communicating with the first combustion chamber being provided in a circumferential wall portion of the ignition chamber cup, a second communication hole, for communicating with the first combustion chamber being provided in a circumferential wall portion of the second combustion chamber cup, a cup-shaped cover member covering the second combustion chamber cup and closing the second communication hole, a disk-shaped retainer for retaining the first gas generating agent, being disposed in the housing and provided with a first opening and a second opening, the disk-shaped retainer being mounted by fitting the first opening to the ignition chamber cup and putting the second combustion chamber cup through the second opening, an annular gap being formed between the second opening and the cover member covering the second combustion chamber cup.
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