Seat belt with load leg

The present invention relates to a seat arrangement in accordance with claim 1, having a seat base 100 to which a seat can be selectively engaged and disengaged, a load leg 200 extending from one end of the seat base 100 for engaging a vehicle floor, and a lock off device 300 for a seat belt, the lock off device comprising: an inner member 302 fixed to a surface of the seat base; and an outer member 304 having one end immovably integral with one end of the inner member 302 and superimposed over the inner member 302 so that a tapering clearance, into which a seat belt webbing can be easily slid, is established between the free end of the outer member 304 and a corresponding end of the inner member 302.