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1. An airbag apparatus comprising:
an airbag having an inflation portion that is deployed and inflated by inflation gas supplied in response to an impact to a vehicle; and a partitioning member arranged in the inflation portion, wherein the partitioning member divides at least part of the inflation portion into an upstream inflation portion, to which the inflation gas is supplied, and a downstream inflation portion, to which the inflation gas is supplied via the upstream inflation portion, wherein the partitioning member includes a pair of overlapping portions and a pair of non-overlapping portion each being continuous with one of the overlapping portions, wherein, in the upstream inflation portion, the overlapping portions are overlapped with each other in a band-like shape and joined to each other by a joint portion located at the boundary between the overlapping portions and the non-overlapping portions, the partitioning member further includes an opening that is formed at a portion of the overlapping portions where the overlapping portions are not joined to each other by the joint portion, a pair of valve bodies sandwiching the opening, and a pressure regulating valve, wherein, before the upstream inflation portion restrains an occupant, the pressure regulating valve is closed by the valve bodies being pushed against each other in the upstream inflation portion by the inflation gas, and wherein, when the upstream inflation portion restrains the occupant, external force generated by the restraint flexes the valve bodies via the partitioning member and separates the valve bodies from each other, so that the pressure regulating valve is opened, and a stress relaxation portion arranged in the overlapping portions, wherein, when the pressure regulating valve is opened, the stress relaxation portion relaxes stress acting on part of the joint portion that is adjacent to the opening.
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