To provide a roller skate link having a floor plate structure which has a little heat effect and develops a little welding strain, flexure, etc., caused by the welding.

One part side of the floor plate constituting piece is disposed on a joist 1 and the side surface lower part of this floor plate constituting piece is combined to the joist 1 with a fillet-welding and also, the side surface lower part faced to the other part side of the floor plate constituting piece is formed by cutting off. The mutual side surfaces of both floor plate constituting pieces at the one part side and the other part side, are butted and disposed so as to bring into contact with mutual side surfaces, and the mutual floor plate constituting pieces at the one part side and the other part side are combined with a partial fusing welding welded from the upper surface.