VEHICLE SEAT DEVICE

A vehicle seat device includes: a detection unit that detects a side collision in a vehicle; a seat that is provided in a vehicle cabin so that the seat can be located at a center portion of the vehicle cabin in a vehicle width direction and that can face at least one of a front side and a rear side in a vehicle front-rear direction; a restraint portion that is provided on a seat side portion and that is movable between a retracted position in which the restraint portion does not face a seated occupant seated in the vehicle width direction, and a facing position in which the restraint portion faces the occupant in the vehicle width direction; and a movement control unit that positions the restraint portion at the facing position when the seat is located at the center portion and the detection unit detects the side collision.