A protector body is formed with a semi-annular portion. The semi-annular portion has an inner peripheral surface projected with a rib to engage with a trough portion of the corrugated tube. The lid is provided with a larger-diameter lid and a smaller-diameter lid depending upon a diameter of the corrugated tube. The larger-diameter lid is made symmetric in form with the semi-annular portion formed in the protector body while the smaller-diameter lid has a flange projecting, at both sides, from a semi-annular frame portion corresponding to a diameter of small-diameter corrugated tube and a rib, to engage in a trough portion of the corrugated tube, projecting in an inner peripheral surface of the semi-annular frame portion. The flange on both sides has a lock portion at tips thereof thus enabling locking with the locked portion of the semi-annular frame portion.