Positioning of a shield electric wire is performed by an insertion jig in front of a peeling jig, and a portion at a distal end of the shield electric wire where a metal foil is exposed is inserted into an electric wire insertion hole of a peeling jig through the center hole of an insertion jig. Air is blown from an opening on an other-end-surface side of the peeling jig toward the distal end of the shielded electric wire, and the metal foil is expanded while being separated from a wire core. A cut is formed from a side of a metal foil expanded by blowing air in a predetermined gap between a one-end-surface of the peeling jig and an end surface of the insertion jig, and the metal foil is cut from the cut as a starting point.