Patent ID: 8439395

Claim:
An airbag inflating and expanding toward a target to be protected, when gas is introduced in a retracted and accommodated state, said airbag comprising: a first bag substantially shaped like a bag in which an outside top face portion opposed to the target to be protected is provided while the first bag inflates and expands; a gas introducing portion from which gas is to be introduced; a second bag substantially shaped like a bag which extends and is defined between an inside top portion and the gas introducing portion, and having an inside top face portion which is disposed inside of the first bag and opposed to the outside top face portion, and a gas distributing portion at which gas is distributable, the second bag being independent of the first bag; and a jointing portion detachably jointing parts of the outside top face portion of the first bag and the inside top face portion of the second bag with each other on the airbag front face that is opposed to the target to be protected, with the outside top face portion of the first bag and the inside top face portion of the second bag being superimposed in a sheet-like intimate contact with each other in a manner that all the jointed parts are completely detachable.