Airbag device for front passenger seat

An airbag device for a front passenger seat comprising:

• a housing adapted to be mounted in front of a front passenger seat of a vehicle;
• an airbag that is housed in the housing in a folded-up configuration and inflatable with an inflation gas to emerge out of the housing and be deployed rearward, the airbag including:
• a main bag section that includes at a rear plane thereof as deployed a front-collision arresting plane for catching a passenger that moves forward;
• an auxiliary bag section that is deployable in such a manner as to protrude rearward out of either a left region or a right region of the front-collision arresting plane, the auxiliary bag section including an oblique-collision arresting plane, the oblique-collision arresting plane is disposed on a lateral of the auxiliary bag section for catching the passenger that moves diagonally forward, the oblique-collision arresting plan extends from the front-collision arresting plane and faces towards the front-collision arresting plane;
• and
• a folded-up body that is the folded-up configuration of the airbag, the folded-up body including a holding means for preventing the auxiliary bag section from protruding out of the front-collision arresting plane in an initial stage of airbag deployment in which the airbag emerges out of the housing.