Patent ID: 8915519

Claim:
A method for manufacturing an airbag, wherein the airbag is formed into a bag shape by joining peripheral portions of two main body fabric portions and has an inflation portion that is inflated by inflation gas, the airbag includes two structural fabric portions, a first partition is installed to extend between the main body fabric portions, a second partition having an extended end is installed to extend between the main body fabric portions in a state in which the second partition extends in a direction intersecting with the first partition and the extended end is overlaid onto the structural fabric portions, at least a part of the inflation portion is divided into a plurality of inflation chambers by the first partition and the second partition, the airbag manufacturing method comprising: a first joining step, in which a peripheral portion in each structural fabric portion that is brought closer to the main body fabric portions at the installation is joined to the main body fabric portions in a spread state; a second joining step, in which, in a pair of outer peripheral portions of the second partition in a spread state, a part that is not overlaid onto the structural fabric portions is joined to the main body fabric portions, and a part that is overlaid onto the structural fabric portions is joined only to the structural fabric portions; and a third joining step, in which peripheral portions of the structural fabric portions that are separated away from the main body fabric portions at the installation are joined to each other.