Patent ID: 8157292

Claim:
A seat belt device for a vehicle, the seat belt device comprising: a buckle head mounted on a seat and designed to couple with a tongue; and a carriage unit allowing the buckle head to be displaced in horizontal and vertical directions of the seat so that the buckle head and the tongue are easily coupled to or decoupled from each other when an occupant fastens or unfastens a belt, wherein the carriage unit includes: a screw arranged in a horizontal direction of the seat so as to rotate forward and backward; a slide plate movable following the rotation of the screw; a buckle strap having a slit, wherein one end of the buckle strap is hinged to the slide plate and the other end of the buckle strap is coupled to the buckle head; and a connecting plate, wherein one end of the connecting plate is pivotally connected to the slit of the buckle strap and the other end of the connecting plate is slidable in a proceeding direction of the slide plate.