Patent ID: 8727378

Claim:
An air bag comprising: an air bag main body formed as a bag body so as to have a surface facing to an occupant and a surface opposite to the occupant in an inflated state; a coupling member configured to couple said surface facing to the occupant and said surface opposite to the occupant inside said air bag main body; a vent hole formed in said surface opposite to the occupant; a lid member including one end fixed to said surface opposite to the occupant and another end supported by said surface opposite to the occupant so as to normally close said vent hole; and a connecting member including one end fixed to said coupling member and another end fixed to the another end of said lid member, wherein said coupling member includes: a bent part bent at least one position of a middle portion of the coupling member; and a connect portion configured to maintain a bent state of said bent part, said connect portion is provided at a plurality of positions of said bent part for expanding said coupling member step by step, and a density of arrangement of the connect portion at the plurality of positions is sparser toward a rear stage so that a connection releasing time from a front stage to the rear stage becomes quickened gradually.