An exterior member (16) has a plurality of non-flexible tube portions (25) as straight portions. A plurality of recesses (30) is formed on the inner surface (23) of the non-flexible tube portions (25) to dent the inner surface (23). The recesses (30) are formed as annular dents extending in the circumferential direction. Additionally, recesses (30) are formed as dents having a prescribed depth. The recesses (30) are formed into a shape which allows a high-voltage conductive channel (15) to not come in contact with the high-voltage conductive channel (15) while the high-voltage conductive channel (15) is inserted through the exterior member (16).