Airbag device

An airbag device comprising:

• an airbag that is supported by a peripheral edge of an accommodating portion in a vehicle body side member and completes inflation so as to be able to receive an occupant by causing inflation gas to flow therein and protruding from the accommodating portion disposed in the vehicle body side member at a time of operation, wherein:
• an outer peripheral wall of the airbag at a time of inflation completion includes an occupant side wall portion capable of receiving the occupant, and a vehicle body side wall portion whose outer peripheral edge is connected to an outer peripheral edge of the occupant side wall portion and that is supported by the vehicle body side member at the peripheral edge of the accommodating portion;
• in the vicinity of a center of the vehicle body side wall portion, an inflow opening that is opened to allow the inflation gas to flow in, and an attachment portion that is disposed at a peripheral edge of the inflow opening and is fixed to an accommodating portion side are provided;
• the airbag includes an outer bag constituting the outer peripheral wall at the time of inflation completion, and an inner bag disposed so as to inflate inside the outer bag and having a plurality of supply ports through which the inflation gas is supplied to the outer bag, the outer bag and the inner bag sharing the inflow opening and the attachment portion;
• the inner bag completes the inflation prior to the outer bag, and the outer bag is inflated by the inflation gas supplied from the supply ports;
• an outer peripheral wall of the inner bag at the time of inflation completion includes:
• an upper side wall portion facing the occupant side wall portion of the outer bag;
• and
• a lower side wall portion whose outer peripheral edge is connected to an outer peripheral edge of the upper side wall portion, that faces the vehicle body side wall portion, and in which the inflow opening and the attachment portion are disposed;
• at least one of the plurality of supply ports is provided as a lower side supply port disposed in the lower side wall portion;
• and
• a gas guide tether that connects a vicinity of an outer edge side of the lower side supply port and the vehicle body side wall portion so as to be able to guide the inflation gas supplied from the lower side supply port to a vehicle body side wall portion side in an inner peripheral surface of the outer bag along a radial direction centered on the inflow opening is provided.