Seat belt device

In order to provide a seat belt device which allows easy connection of a lap anchor fixed to one end of a seat belt relative to a vehicle body or the like even when a seat weight sensor is installed below a vehicle seat a seat weight sensor (8) is installed below a vehicle seat (9). The seat weight sensor (8) and the vehicle seat (9) are fixed to a vehicle body floor (11). A hitch member (14) is attached to the seat weight sensor (8) via a mounting bracket (13) by a bolt (15). A lap anchor (7) is fixed to one end of a seat belt (2). By locking the lap anchor (7) to the hitch member (14), the seat belt (2) is connected to the seat weight sensor (8) (that is, a vehicle body). In this manner, the seat belt (2) can be easily connected to the vehicle body just by locking the lap anchor (7) to the hitch member (14).