SIDE AIRBAG DEVICE

A side airbag device includes a side airbag configured to protect a side of an occupant by being developed and expanded when a vehicle is impacted from the side direction. The side airbag is formed with a shoulder portion compartment corresponding to a shoulder portion of the occupant, a waist portion compartment, and a chest portion compartment. The shoulder portion compartment includes a first wrap section that overlaps, when viewed in a side direction of the vehicle, a B pillar, a second wrap section that overlaps, when viewed in the side direction of the vehicle, a door main body section, and an intermediate section that is formed between the first wrap section and the second wrap section and travels from the first wrap section toward the second wrap section along a door belt line.