Patent ID: 7784829

Claim:
A gas generator for an air bag, comprising: a cylindrical housing including a first end and a second end opposite to the first end, and provided with a gas discharging port; an inner cylindrical member having a first outside diameter portion at one end thereof and a second outside diameter portion, larger than the first outside diameter portion, at another end opposite to the one end, the inner cylindrical member being provided inside the cylindrical housing, such that the second outside diameter portion is in contact with an inner circumferential surface of the cylindrical housing and defining a cylindrical space between the inner circumferential surface of the cylindrical housing and the first outside diameter portion, the first outside diameter portion defining a first accommodating space therein and also having an opening provided locally in a periphery thereof only in a vicinity of the one end for allowing communication between the first accommodating space and the cylindrical space, and the second outside diameter portion defining a second accommodating space therein; a first gas generating agent provided inside the first accommodating space; and ignition means provided in the second accommodating space.