17 along the harness guide path 9 the wire harness 6 is then curved substantially in a loop form from the lower end of the guide path 9 along the peripheral wall 7 of the harness accommodating portion 11 and is led from the right side port 14 to the outside in conjunction with the rotation of the link 2 the wire harness 6 is slid upward on the guide path 9 and is drawn out from the guide wall 17 so that the radius of curvature of the loop shaped harness portion bent portion 12 is slightly smaller than that of the state shown in fig1 a as the wire harness 6 bulges outward substantially in the loop form inside the accommodating portion 11 by the restoring force due to its own rigidity the excess length of the harness is absorbed drawn into the accommodating portion 11 and the wire harness 6 is routed in a smooth curved shape without slack between the guide wall 17 of the protector 5 and the harness fixing portion 15 of the link 2 since the excess length of the harness is not produced it is possible to prevent the bending of the wire harness 6 and the interference with the link 2 and the like due to the excess length of the harness even at an intermediate position between fig1 a and fig1 b i e in a state in which the link 2 is positioned at a leftwardly upward halfway in the rotation of the link 2 in.