A seatbelt system includes a buckle stay. The buckle stay is provided with an anchor for being fixedly fastened on a vehicle body and also with a buckle stay member fixed at an end thereof on the anchor and connected at an opposite end thereof with a buckle base of the seatbelt system. The buckle stay member is branched into a plurality of end portions on a side of its one end where the buckle stay member is fixed on the anchor. The branched end portions are fixedly secured in the anchor portions, respectively.