VEHICLE SEAT DEVICE

Provided is a vehicle seat device capable of suitably restraining an occupant by means of a seat belt device. A vehicle seat device S1 includes a seat main body having a seat cushion 1 and a seat back 2, a reclining device 30 connecting the seat back 2 to the seat cushion 1 so as to be pivotable and capable of locking a pivoting motion of the seat back 2, and a seat belt device 40 for restraining an occupant seated on the seat main body. The seat belt device 40 includes a lap belt 41b restraining the occupant's lumbar or thighs, a belt anchor 44 attached at a position beside the seat main body and having a belt engaging portion 44d engaging with an engaged portion provided in a tip portion of the lap belt 41b, and an anchor moving device 50 capable of moving the belt engaging portion 44d of the belt anchor 44 in a seat front to back direction with respect to the seat main body.