Airbag device

An airbag device having a hollow airbag which constrains an occupant by being deployed by gas supplied by an inflator, and which includes a first face-constituting base fabric facing a side of the occupant, and a second face-constituting base fabric facing a side opposite to the occupant,

• the airbag comprising:
• a vent hole which is provided in the second face-constituting base fabric, for discharging the gas;
• a slide tether which is provided from an inner surface of the second face-constituting base fabric to an inner surface of the first face-constituting base fabric, and which performs transition of a state of the vent hole, from an open state via a close state to the open state, by changing between a slackened state and an extended state;
• and
• a slide tether cover which is provided with an opening communicated with the vent hole, one end of which is fastened to the inner surface of the second face-constituting base fabric, and which guides the slide tether,
• wherein the slide tether includes a body portion, bifurcated portions which are bifurcated from one end portion in a longitudinal direction of the body portion, and leg piece portions which are respectively extended from the bifurcated portions,
• wherein the other end portion in the longitudinal direction of the body portion constitutes a first supporting point by being fastened to an inner surface of the second face-constituting base fabric in a direction going from the vent hole toward a mounting position of the inflator,
• wherein the bifurcated portions constitute a second supporting point by the other end portion of the slide tether cover being fastened to the inner surface of the second face-constituting base fabric,
• wherein extended terminal end portions of the leg piece portions constitute a third supporting point by being respectively fastened to the inner surface of the first face-constituting base fabric, and
• wherein, when the airbag is deployed, transition of a state of the vent hole is performed based on a force acting in an airbag deploying direction which is generated with the first supporting point and the third supporting point as a starting point, and a force acting, in a direction intersecting with the airbag deploying direction, which is generated with the second supporting point as a starting point.