Patent ID: 8562015

Claim:
A vehicle side airbag device comprising: a side airbag configured in a bag shape by an outer cloth positioned at a vehicle width direction outside and an inner cloth positioned at a vehicle width direction inside, the side airbag comprising one or more high pressure chambers on a high pressure side during inflation and deployment and a low pressure chamber that is at lower pressure than the one or more high pressure chambers during inflation and deployment, the side airbag inflating and deploying to the side of an occupant seated in a vehicle seat when a side-on collision occurs; an inflator that ejects inflation gas from a gas ejection section and supplies the gas into the side airbag during a side-on collision; and a partitioning member that is provided between the outer cloth and the inner cloth, is configured by a single piece of cloth, and comprises a partitioning wall that partitions between the one or more high pressure chambers and the low pressure chamber, a diffuser that mainly distributes gas ejected from the gas ejection section of the inflator to the high pressure chamber side and also distributes gas to the low pressure chamber side, and a non-return valve that permits gas to flow from the low pressure chamber side to the high pressure chamber side and restricts gas from flowing in a reverse direction, wherein: the partitioning wall is positioned at a vehicle seat front side of the partitioning member and is formed by folding the partitioning member so as to project towards the low pressure chamber side or towards the high pressure chamber side; the diffuser is positioned at a seat rear side of the partitioning member and is formed by folding the partitioning member to project towards the seat front side so as to extend further to the high pressure chamber side than a height position of the partitioning wall; and the non-return valve is formed as an opening section on the high pressure chamber side of the diffuser and opens and closes according to the flow of gas.