An airbag device includes an inflator that is installed in an upper part of a vehicle seat, and that generates gas in an event of a vehicle collision, an airbag to which the gas from the inflator is supplied, and is inflated and deployed from the upper part of the vehicle seat toward a front side of the vehicle seat, and a diffuser that distributes the gas to the airbag. The diffuser includes a connecting portion that is connected to the inflator, and a plurality of branching portions that each branch from the connecting portion and connect to the airbag. The diffuser includes a silencing portion in at least the branching portions. The silencing portion reduces sound pressure of the gas.

An airbag device includes: an inflator generating gas at a time of a collision of a vehicle; and an airbag to which the gas is supplied, and that inflates and expands from a seat rear side of an upper portion of a vehicle seat toward a seat front side, and slips-through between a ceiling of a vehicle cabin and a head of a passenger seated in the vehicle seat. The airbag has at least one gas supply path that is provided so as to be directed toward the seat front side and whose angle of incidence with respect to the ceiling in a side view seen from a seat transverse direction is set to be an acute angle.

A vehicle occupant restraint system (10) includes a center airbag (12) which, in an inflated state, extends between two vehicle seats (14) positioned next to each other and which has an inflatable torso gas bag (16) and an inflatable head gas bag (18) connected to the torso gas bag (16). The torso gas bag (16) comprises a laterally projecting, as seen in the longitudinal direction of the vehicle (L), inflatable protrusion (36) which is designed and arranged to abut, in the completely inflated state of the center airbag (12), against a vehicle structure (32) between the vehicle seats (14) and to support the center airbag (12) against a lateral force (F).

A left-right pair of rear tethers is configured such that one-end portions thereof are anchored to a left-right pair of front-rear extension portions, other-end portions thereof are anchored to a seatback or to the vehicle body, and during passenger restraint each of a left-right pair of front-rear extension portions is pulled relatively in a seat diagonally rearward and downward direction such that a coupling portion approaches a femur area of a passenger.

A seat-mounted airbag device is provided with an airbag including front-and-rear chambers and an airbag main body. At a time of collision of a vehicle, gas jetted out from an inflator is supplied to the front-and-rear chambers, which inflate and expand to a front side along left and right sides of the head of a vehicle occupant. In association with the inflation and expansion of the front-and-rear chambers, the airbag main body moves to the front side, passing between the head of the vehicle occupant and a vehicle cabin ceiling. The gas is supplied from the front-and-rear chambers to the airbag main body, which inflates and expands and is disposed at the front side of the vehicle occupant.