SIDE AIRBAG DEVICE AND METHOD OF MANUFACTURING A SIDE AIRBAG DEVICE

[Problem] [0002] To provide a side airbag device and a method for manufacturing the side airbag device, which can achieve both occupant protection performance and a degree of freedom in designing a driver seat. [0003] [Resolution Means] [0004] The side airbag device 4 is incorporated in an inner space of a backrest 22 of one of two seats lined up in a vehicle in the vehicle width direction, being secured to an inner side of the skeletal frame 223 of the backrest 22, comprising: an inflator 43 that injects gas, and an airbag cushion 41 which expands and deploys, based on the gas injected by the inflator 43, between the first and the second seats, where the airbag cushion 41 has a storing part 41d for storing the inflator 43, a first portion extending in the horizontal direction to one side of the storing part 41d and a second portion extending to the other side thereof, and at least the storing part 41d and the first portion extending in one side of the airbag cushion 41 before expansion and deployment is arranged on the inside of the skeletal frame 223.