To make a laminate film the same width as circuit conductors so as to avoid loss, and require no cutting facility by sticking in independently formed fitting piece to the laminate film insulation protecting flat circuit conductors.

In an electric wiring in which a plurality of copper rows are arranged in parallel so as to comprise flat circuit conductors 3 and the same is insulation protected by a laminate film 1, a fitting piece 2 independently formed of the laminate film 1 is stuck thereto. The fitting piece 2 equipped with a hole for fixture fitting 2A is made of a plastic film similar to the laminate film 1, is formed into predetermined width and length, preferably in thicker, and is stuck to the laminate film 1 in a lengthwise direction. The fitting piece 2 is arranged between the conductors 3 and the laminate film 1, or on the outer face of the laminate film 1, or a U-shaped fitting piece is arranged between the conductors 3 and the laminate film 1, or on the outer face of the laminate film 1, and is stuck thereto. The fitting piece 2 may be formed of a resin-made plate or the like.