Patent ID: 7946618

Claim:
An airbag device comprising: a bag body that is deployed by internal pressure rising as a gas is supplied into the bag body; a gas pressure adjustment portion that is provided on the bag body so as to be able to release the gas from an inside of the bag body only to an inward side in a vehicle width direction during a deployed state of the bag body, the gas pressure adjustment portion includes a first cylindrical tube vent having a base end portion connected to an edge of a hole portion that is formed in a side portion of the bag body that faces inward in the vehicle width direction during the deployed state of the bag body, and which is able to release the gas from the inside of the bag body when a distal end of the first tube vent stretches out to the outside of the bag body; a tether having a base end portion and a distal end portion, the base end portion being latched to the distal end of the first tube vent; and a tether retention device which holds the distal end portion of the tether; wherein the tether retention device holds the first tube vent in a state where the distal end portion of the tether extends inside the bag body and discontinues a retention of the distal end portion of the tether when the bag body is in the deployed state and wherein the first tube vent stretches out to the outside of the bag body when the retention is discontinued.