A wiring structure of electric wire is provided in which the efficiency of wiring electric wires can be improved and the wiring space can be saved. The wiring structure of electric wire includes an electric wire having a U-shaped excessive part provided in its middle part along the relatively-moving direction of two structures, and a longitudinally-appended spring member provided longitudinally along the electric wire. Fixing positions P1 and P2 of opposite ends of the electric wire are set to offset positions which are deviated in position respectively in two directions perpendicular to the relatively-moving direction of the two structures, and an elastic rod member which has a circular or regular polygonal cross section, having a property of non-biased bending in direction, is used as the longitudinally-appended spring member.