OCCUPANT PROTECTION DEVICE

An occupant protection device of a configuration that protects an occupant seated on a seat, in which an airbag is held in a holding body disposed in a periphery of a hip portion of the occupant. The airbag has a bag main body, and a conduit portion that causes an inflating gas discharged from an inflator to flow into the bag main body. The bag main body is held in the holding body in a state of a completely folded body folded using a front-rear reduction folding such that a width dimension in front-rear direction is reduced from a state of a preliminary folded bag. The completely folded body is formed by a lower side rolled region which is formed by a lower side region of the preliminary folded bag being wound from a lower edge side, being stacked on an upper side rolled region which is formed by an upper side region of the preliminary folded bag.