A flat cable 11 has a connecting end 23 provided with a conductor exposing part 24, in which an insulating coating 22 is removed so as to be electrically connected to a plurality of terminals 3 and a plurality of conductors 21 are exposed. A cable holder 12 has a cable winding part 26 around which the conductor exposing part 24 is wound so as to be turned back and a provisional holding part 27 which is rotatably supported and presses and holds the connecting end 23. A fitting housing 13, is fitted into a to-be-connected housing element 2 with the connecting end 23 and the cable holder 12 inserted thereto. A clamping part 14 is arranged in an insertion port 36 of the fitting housing 13, presses the provisional holding part 27 to the cable winding part 26, and presses and clamps the connecting end 23 to the cable winding part 26 from both sides.