Webbings 14 and 15 each having a male metal piece 17 and a female metal piece 18 of a retaining metal fitting 16 are fitted to right and left roof supports 13a and 13b provided on the rear side of a driving position 3 of a slewingupperstructure, so as to constitute the seatbelt B of a two-point- support type. 上部旋回体の運転席3の後側に設けられた左右の屋根支柱13a,13bに、それぞれ止め金具16の雄金具17、雌金具18を有するウェビング14,15を取付けて二点式のシートベルトBを構成する。 - 特許庁