OCCUPANT PROTECTION DEVICE

An occupant protecting device provided inside or below a seat cushion of a vehicle seat, comprising an airbag cushion capable of expanding and deploying a seat surface of the seat cushion; and an inflator. The airbag cushion includes a lower panel, an upper panel longer than the lower panel in the front-rear direction of the vehicle seat, and mutually opposing side panels joined to the lower panel and the upper panel. The airbag cushion has a first mounting point attached to the vehicle seat side and a second mounting point attached to the vehicle seat side on the rear side of the first mounting point in the front-rear direction of the vehicle seat. The lower panel and the upper panel are mutually joined to a first mounting point and a second mounting point.