Vehicle seat with an occupant protecting device provided inside or below a seat cushion of the vehicle seat, comprising: an airbag cushion capable of expanding and deploying to push up a seat surface of the seat cushion; and an inflator configured to supply gas for expansion and deployment into the airbag cushion in the event of a vehicle emergency; wherein the airbag cushion has: at least one first attaching point (60a, 60b) configured to attach to a first securing position of the vehicle seat; at least one second attaching point (62a, 62b) configured to attach to a second securing position of the vehicle seat on a rear side of the at least one first attaching point in a front-rear direction of the vehicle seat; and an expanding and deploying part that is configured to be expanded and deployed by the gas from the inflator, wherein at least a portion of the expanding and deploying part overlaps itself in an up-down direction by folding between the at least one first attaching point (60a, 60b) and the at least one second attaching point (62a, 62b) in a condition prior to expanding and deploying; characterised in that the airbag cushion has a distance between the at least one first attaching point (60a, 60b) and the at least one second attaching point (62a, 62b) that is longer than a distance between the first securing position and the second securing position, in a flatly spread out condition prior to attaching to the vehicle seat. an airbag cushion capable of expanding and deploying to push up a seat surface of the seat cushion; and an inflator configured to supply gas for expansion and deployment into the airbag cushion in the event of a vehicle emergency; wherein the airbag cushion has: at least one first attaching point (60a, 60b) configured to attach to a first securing position of the vehicle seat; at least one second attaching point (62a, 62b) configured to attach to a second securing position of the vehicle seat on a rear side of the at least one first attaching point in a front-rear direction of the vehicle seat; and an expanding and deploying part that is configured to be expanded and deployed by the gas from the inflator, at least one first attaching point (60a, 60b) configured to attach to a first securing position of the vehicle seat; at least one second attaching point (62a, 62b) configured to attach to a second securing position of the vehicle seat on a rear side of the at least one first attaching point in a front-rear direction of the vehicle seat; and an expanding and deploying part that is configured to be expanded and deployed by the gas from the inflator, wherein at least a portion of the expanding and deploying part overlaps itself in an up-down direction by folding between the at least one first attaching point (60a, 60b) and the at least one second attaching point (62a, 62b) in a condition prior to expanding and deploying; characterised in that the airbag cushion has a distance between the at least one first attaching point (60a, 60b) and the at least one second attaching point (62a, 62b) that is longer than a distance between the first securing position and the second securing position, in a flatly spread out condition prior to attaching to the vehicle seat.