Wire harness manufacturing method and wire harness

1. A manufacturing method of a wire harness in which plural cables are bundled by a sheet having an adhesive layer, the manufacturing method comprising:

a first step of preparing a first sheet and a second sheet, each of which comprising a base sheet and a self-adhesive layer formed on a whole of only first surface of the base sheet;

a second step of forming a single long sheet by bringing end portions of the self-adhesive layers of the first sheet and the second sheet to each other;

a third step of placing the plural cables on a non-self-adhesive-layer of the first sheet of the long sheet at a position that is located in a region where the first sheet and the second sheet are in contact with each other;

a fourth step of forming an intermediate member by winding the first sheet on the plural cables so that a non-self-adhesive layer formed on a second surface, opposite to the first surface, of the first sheet is located inside; and

a fifth step of winding the second sheet on the intermediate member so that the self-adhesive layer of the first surface of the second sheet is located inside.

2. The manufacturing method according to claim 1 , wherein in the fourth step, the intermediate member is formed so that the first sheet is wound on the plural cables so as to have an open portion that exposes a part of outer circumferences of the plural cables; and

wherein in the fifth step, the second sheet is wound on the intermediate member so as to cover the open portion of the first sheet.

3. The manufacturing method according to claim 1 , wherein the first sheet is wound on the plural cables in the fourth step in a first direction, and the second sheet is wound on the intermediate member in the fifth step in a second direction opposite of the first direction.