There is provided an electric wire 1 comprising an electrically-conductive conductor portion and an insulating cover portion 11 covering the conductor portion. A colored marker 13 is provided on an end portion of the cover portion 11. The colored marker 13 indicates that the electric wire is a manually-incorporated wire. A circuit identifier 12 is provided on an intermediate portion of the cover portion 11. The circuit identifier 12 is made by printing or provided in the form of a mark and indicative of a connection destination of the electric wire 1. The colored marker in the end portion is made by an ink inferior to that of the circuit identifier on the intermediate portion in at least one property selected from among adhesiveness, weatherability, heat resistance, and chemical resistance.