OCCUPANT PROTECTION DEVICE

An occupant protecting device that contributes to improving the waist restraining performance of an occupant is disclosed. An occupant protecting device (30) provided inside or below a seat cushion (2) of a vehicle seat (100), containing: an airbag cushion (32) capable of expanding and deploying to push up a seat surface (26) of the seat cushion (2); and an inflator (34) that supplies gas for expansion and deployment into the interior space (33) of the airbag cushion (32) in the event of a vehicle emergency. The airbag cushion (32) includes a lower panel (40), an upper panel (42) longer than the lower panel (40) in the front-rear direction of the vehicle seat (100), and mutually opposing side panels (44a, 44b) joined to the lower panel (40) and the upper panel (42). The airbag cushion (32) has a first mounting point (101) attached to the vehicle seat (100) side and a second mounting point (102) attached to the vehicle seat (100) side on the rear side of the first mounting point (101) in the front-rear direction of the vehicle seat (100). The lower panel (40) and the upper panel (42) are mutually joined proximal to a first mounting point (101) and a second mounting point (102), respectively.