OCCUPANT RESTRAINT DEVICE FOR VEHICLE

The occupant restraint device for a vehicle includes a seatbelt, which restrains an occupant P sitting on a vehicle seat at the vehicle seat, and a belt backing airbag. When gas is supplied to the belt backing airbag from an inflator at a time of frontal collision of the vehicle, the belt backing airbag inflates and expands between at least the shoulder belt of the seatbelt and the shoulder area of the occupant. Together with moving to a vehicle front side to follow the occupant moving to the vehicle front side due to inertial force, the belt backing airbag moves along the shoulder belt and maintains the state in which the belt backing airbag is interposed between at least the shoulder area of the occupant and the shoulder belt.