Patent ID: 8783712

Claim:
A side airbag device for a vehicle, comprising: a gas generating device which is actuated to generate gas; a side airbag in which a front bag portion and a rear bag portion are defined by a front-rear partition section having a front-rear communication opening, gas supplied from the gas generating device into the rear bag portion is supplied into the front bag portion through the front-rear communication opening to allow the side airbag to be inflated and deployed from an outside portion in a vehicle width direction of a seat back of a vehicle seat, and the front bag portion is arranged on a vehicle front side of the rear bag portion in an inflated and deployed state; and an extending member which is provided in the rear bag portion and extended in the inflated and deployed state to restrict inflation of the rear bag portion in a vehicle fore-and-aft direction and thereby enlarges the inflation width of the rear bag portion in the vehicle width direction.