Patent ID: 8393639

Claim:
An inflator comprising: an inflator case including a pair of base wall portions that close end portions in an axial direction of a peripheral wall portion in which a gas ejection hole is formed; an ignition device disposed at an inner portion of the inflator case; a holding member disposed at the inner portion of the inflator case, that accommodates and holds a gas generating agent that generates gas as a result of being ignited by the ignition device and combusting; and a gas flow path, that promotes heat exchange between high temperature gas generated at a combustion chamber and the inflator case, formed at an inner side of the inflator case and at a periphery of the holding member, such that the combustion chamber defined by at least the holding member is communicated with the gas ejection hole, wherein the gas ejection hole is offset in an axial direction of the inflator case, with respect to a central position of the combustion chamber in the axial direction of the inflator case, a separation wall that forms a part of the holding member and that is provided with a communication hole that communicates the combustion chamber with the gas flow path, is disposed at least at a side opposite a side of the holding member in an inflator case axial direction at which the gas ejection hole is disposed, such that the inflator does not use a filter, and the communication hole is formed inclined away from the gas ejection hole with respect to a plate thickness direction that passes through the communication hole.