Patent ID: 8020891

Claim:
A vehicular airbag device comprising: an airbag that is folded and accommodated in an accommodation portion provided in front of a vehicular seat, wherein the airbag is deployed toward an occupant seated in the vehicular seat by being supplied with a gas when a head-on collision occurs, and includes a vent hole that allows the gas to be discharged to an outside of the airbag in restraining the occupant; and an opening degree change portion that changes an opening area of the vent hole in accordance with a direction of impact of an upper body of the occupant with the airbag during deployment of the airbag, the opening degree change portion includes a valve body and a tether, the valve body is provided at a position on an outer face of the airbag so as to cover the vent hole, the tether has one end coupled to the valve body outside of the airbag and the other end of the tether is attached to an interior ceiling portion of the airbag; wherein, upon deployment of the airbag, the tether is vertically stretched in a side view of the vehicle, and the tether urges the valve body so as to close the vent hole, and wherein the opening degree change portion reduces the opening area of the vent hole when the upper body of the occupant wholly moves forward to impact with the airbag, and increases the opening area of the vent hole when the upper body of the occupant rotates around a lumbar region thereof and the upper body of the occupant moves forward and downward to impact with the airbag.