Airbag device

An airbag device including an airbag that is folded, and that is expanded by means of an inflation gas that is supplied from an inflator, wherein

• the airbag has a gas excavation hole and a pulling member that is a base cloth valve configured to open or close the gas evacuation hole,
• the pulling member has:
• a first mount portion that is mounted on an occupant-side airbag portion when the gas evacuation hole is defined as a center;
• a second mount portion that is mounted on a vehicle-side airbag portion when the evacuation hole is defined as a center or that is mounted on a vehicle;
• and a closed portion that is disposed to be able to be superimposed on the gas evacuation hole;
• the pulling member that is the base cloth valve is moved to be pulled by means of relative spacing between the occupant-side airbag portion and the vehicle-side airbag portion, and the closed portion is formed so as to be at least partially superimposed on the gas evacuation hole or so as to move to a restrictive position, and
• the first mount portion is formed by a plurality of mount pieces, is mounted at a plurality of mount points at an occupant side, and is configured so that a distance between the plurality of mount portions is large relative to a dimension in an original shape of the plurality of mount pieces of the pulling member that is the base cloth valve.