An electric wire insertion member includes an axially elongated cutout, a circumferentially elongated cutout, a turnable fitting, a locking projection, and an elastic locking piece. The axially elongated cutout extends frontward from a rear end of the shield pipe. The circumferentially elongated cutout extends from the axially elongated cutout in a circumferential direction. The turnable fitting is configured to be fitted in the shield pipe and to turn in a circumferential direction. The locking projection protrudes from the turnable fitting and configured to enter the axially elongated cutout as the turnable fitting is fitted into the shield pipe and to enter the circumferentially elongated cutout as the turnable fitting turns. The elastic locking piece is configured to be locked in a circumferential direction by a locked surface of the axially elongated cutout when the locking projection is positioned in the circumferentially elongated cutout.