Side airbag device

A side airbag device for providing restraint of an occupant of a vehicle in a seat, comprising:

• an airbag cushion which is built in the seat of the vehicle and inflates and deploys using a gas toward a side of the occupant sitting in the seat and toward a vehicle front side;
• an inflator for providing the gas having a cylindrical shape and having a first end inserted into the airbag cushion to supply the gas to the airbag cushion and a second end;
• and
• a structure which is built in the seat, which extends in a vehicle width direction and is fixed to the seat, wherein
• at least one gas ejection hole adjacent the first end which is disposed inside the airbag cushion to eject the gas;
• a connector which is provided on the second end and to which a harness is connected;
• and
• a stud bolt which is provided at a predetermined location on the inflator and is fastened to the seat,
• the airbag cushion has:
• a chamber formed in a bag shape;
• an extension portion which extends from the chamber on a vehicle rear side and into which the first end of the inflator is inserted;
• and
• a tab which extends from the chamber in the vicinity of the extension portion and is held in the vicinity of the second end of the inflator, and
• the structure is disposed so as to pass through a space portion surrounded by the chamber, the extension portion, the inflator, and the tab, and the airbag cushion is attached to the seat by the stud bolt.