OCCUPANT PROTECTING SYSTEM

In a vehicle, an occupant is suitably protected even when the occupant is seated in the vehicle with the seat inclined and facing a direction different from the advancing direction of the vehicle. A system for protecting an occupant boarding on a seat in a vehicle, where a seat back of the seat is configured to be inclinable with respect to a seat cushion of the seat. The system includes an acquiring unit that acquires environment information related to the vehicle in traveling or the surrounding environment thereof; and a control unit that, when the seat is facing a direction different from an advancing direction of the vehicle and the seat back is in an inclined state with respect to the seat cushion by greater than or equal to a predetermined angle, executes a support control to support the occupant in the seat to resist an inertial force that is assumed to act on the occupant boarding on the seat, based on the environment information.