To inhibit dangling or rolling of an electric wire and enable safe working, when the electric wire (a ground wire, a power line) installed between paths of existing steel towers is shifted to a steel tower located sideways which is formed newly or temporarily.

In a construction method of hanging sheave type line shifting by forming a net, support bus lines have support ropes and coupling ropes, comprising a light and tough Kevlar (R) and mounted to the predetermined number of the hanging sheave at regular intervals, are stretched between the new and old paths of source and destination steel towers from the existing steel tower into a V-shape, bridging ropes comprising Kevlar and coupling the hanging sheave mounted to the both coupling ropes are provided laterally between the both supporting ropes. The rope net is constituted by the hanging sheave are mounted separately via the bridge ropes, and the electric wire suspended through the bridging ropes is moved horizontally.