Patent ID: 8434783

Claim:
A gas generator for a restraining device of a vehicle comprising: a housing forming an outer shell container of the gas generator, having a circumferential wall portion which is provided with a gas discharge port, a first end, and a second end opposite to the first end, the first end and the second end being both closed; a cup-shaped inner tube member disposed in the housing, an inside thereof being an ignition chamber accommodating an ignition device, an outside thereof being a combustion chamber charged with a gas generating agent, the cup-shaped inner tube member including, a bottom surface located in a bottom plate of the first end of the housing, and an opening end portion provided with a ventilating portion for allowing a combustion product of the ignition device to pass therethrough; and an igniter of the ignition device attached to an igniter attaching portion formed at the second end of the housing, a passage for the combustion product defined between an inner wall surface of the cup-shaped inner tube member and the igniter attaching portion, and reaching the ventilating portion, such that the combustion product is released to a side of the second end in the combustion chamber thereby combustion of the gas generating agent proceeds from the second end to the first end.