Patent ID: 8540047

Claim:
A passenger's weight measurement device for a vehicle seat, comprising: lower rails that are attachable to a floor of a vehicle; a movable member of an upper rail side including side frames, the movable member being provided so as to move in a front-back direction with respect to the lower rails; a load sensor having a rod and a main body; an insertion hole portion formed at the movable member, through which the rod of the load sensor is inserted; a ring-shaped bush member that is inserted through the insertion hole portion; and a cylindrical member that is disposed between the ring-shaped bush member and the rod, wherein the cylindrical member is inserted in the ring-shaped bush member so that an outer surface of the cylindrical member contacts an inner surface of the ring-shaped bush member the cylindrical member defines a projecting portion and a cylinder portion, the projecting portion projects outside from the cylinder portion in a radial direction, the projecting portion is disposed at a load sensor main body side of the cylindrical member, and the projecting portion contacts the main body of the load sensor.