PASSENGER SEAT AIRBAG DEVICE

PROBLEMTo provide an airbag device that enables restraining the head of an occupant riding in a passenger seat of a vehicle.RESOLUTIONThe present invention is an airbag device that is stowed in the instrument panel of a vehicle in order to protect an occupant in a passenger seat and includes an inflator for generating expansion gas along with an airbag that inflates and deploys toward the occupant side via gas released from the inflator. The airbag is connected to the inflator and includes a main chamber positioned in front of the occupant properly seated during deployment and a sub chamber connected to at least one side of the main chamber. An inner vent through which gas flows, is formed at a boundary portion of the main chamber and the sub chamber. Furthermore, a check valve for opening and closing the inner vent is provided.