Patent ID: 8820786

Claim:
A side airbag comprising: a pair of main panels that are placed facing each other; a side panel that is formed in a belt shape, that has one long-side edge portion that is sewn to a peripheral edge portion of one of the main panels and another long-side edge portion that is sewn to a peripheral edge portion of the other of the main panels, and that forms an airbag body together with the pair of main panels; and a tether that is formed in a belt shape, that is disposed inside the airbag body in a state in which the tether has been folded at a lengthwise direction center side thereof in such a way that both lengthwise direction sides of the tether are aligned in a direction in which the pair of main panels face each other, and that has one long-side edge portion sewn to the pair of main panels and to a site in the side panel that configures a front of the airbag body and that has another long-side edge portion having both lengthwise direction sides superimposed on top of each other and sewn together, so that the tether sections the inside of the airbag body into an upper chamber and a lower chamber.