Patent ID: 8382155

Claim:
A gas generator comprising: a housing formed by a diffuser shell having a gas discharge port and a closure shell, a first combustion chamber defined in the housing and a first gas generating agent charged in the first combustion chamber, in the first combustion chamber, 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 igniter being accommodated in the ignition chamber inside the ignition chamber cup, a first communication hole, for causing communication with the first combustion chamber at the time of actuation, being provided in a circumferential wall portion of the ignition chamber cup, a second igniter and a second gas generating agent being accommodated in the second combustion chamber inside the second combustion chamber cup, a second communication hole, for causing communication with the first combustion chamber at the time of activation, 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 ignition chamber cup through the first opening and putting the second combustion chamber cup through the second opening, and an annular gap being formed between the second opening and the cover member covering the second combustion chamber cup.