OCCUPANT PROTECTION DEVICE

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 airbag cushion 32 in the event of a vehicle emergency. The airbag cushion 32 has front attaching points 60a, 60b and rear attaching points 62a, 62b attached to the vehicle seat 100 side, and an expanding and deploying part 64 that is expanded and deployed by the gas from the inflator. At least a portion of the expanding and deploying part 64 overlaps itself in an up-down direction by folding between front attaching points 60a, 60b and rear attaching points 62a, 62b in a condition prior to expanding and deploying.