Side airbag device and airbag in side airbag device

A side airbag device comprising, an airbag which expands and deploys beside an occupant sitting in a seat of a vehicle toward the front of the vehicle, and an inflator which supplies an expansion gas from a base part of the airbag toward an end part of the airbag, wherein

• the airbag in a folded state before expanding and deploying includes:
• an overlapping part formed by accordion-folding a first portion of the airbag near the end part;
• a folded-back part which is a second portion of the airbag continuing from the overlapping part to the base part and which is formed on an inner side of the folded-back part in a vehicle width direction by being extended from the back part toward the front of the vehicle and subsequently folded back toward the rear of the vehicle;
• and
• a bent part which is formed by bending a portion of the folded-back part protruding beyond the overlapping part in a direction toward the front of the vehicle and toward a vehicle outer side, and which covers at least a portion of the overlapping part on a vehicle front side of the overlapping part.

A side airbag device comprising, an airbag which expands and deploys beside an occupant sitting in a seat of a vehicle toward the front of the vehicle, and an inflator which supplies an expansion gas from a base part of the airbag toward an end part of the airbag, comprising

• the airbag in a folded state before expanding and deploying includes:
• a folded-back part which is a portion of the airbag continuing from the base part and which is formed on an inner side in a vehicle width direction by being extended toward the front of the vehicle and subsequently folded back toward the rear of the vehicle,
• a bent part within the folded back part, the bent part extending in a direction outboard in the vehicle width direction, and
• an overlapping part extending from the folded-back part formed by accordion-folding or rolling a portion of the airbag near the end part;
• the overlapping part positioned on the outboard side of the folded-back part with the end part of the airbag positioned in a forward direction from a remainder of the overlapping part.