A crimping terminal (10) in which an electric wire connection part (12) is formed in substantially a U shape in cross-section view by having base plate parts (21, 23) and pairs of electric wire crimping pieces (22, 24) is used, and a metallic cap (30) having a tubular peripheral wall in which one end of a longitudinal direction is closed and the other end is opened is attached to a conductor (Wa) exposed by removing a portion of an insulating coating of the distal end of an electric wire W, and an opening end of the cap (30) is inserted into a gap between the conductor (Wa) and an insulating coating (Wb) of the electric wire W and is overlapped with an end of the insulating coating (Wb), and a part (24) of the electric wire crimping pieces is crimped to its overlapped portion (lapped portion) (35).