Patent ID: 8777257

Claim:
A side airbag device for an automobile, comprising: a side airbag stowed in a folded state, including: an occupant side base cloth portion disposed at an occupant side; and a vehicle body side base cloth portion disposed at a vehicle body side portion side, a tether that is disposed inside the side airbag, and of which a height of an attachment portion thereof to the vehicle body side base cloth portion is different from a height of an attachment portion thereof to the occupant side base cloth portion, the tether dividing a cavity inside the side airbag into a lower chamber and an upper chamber, and the upper chamber being in fluid communication with the lower chamber via a communication portion; and a gas jetting unit including: an inflator that, when operated, produces gas and jets out the gas through a plurality of gas jetting holes formed in a lower end portion thereof; a gas jetting aperture which is disposed in the lower chamber and is configured to jet the gas out toward a lower face of the tether when operated, such that a direction of flow of the gas is diverted toward a vehicle lower side while the lower chamber is being inflated, the gas jetting aperture being oriented toward the lower face of the tether; and a diffuser that (i) is formed in a tube shape of which one end is closed off, (ii) aperture is provided.