WIRE HARNESSES MANUFACTURING METHOD AND DEVICE FOR MANUFACTURING WIRE HARNESSES

A wire harness designing method includes, extracting, as a primary common component (Pc1), a component commonly provided in the wire harnesses of all the product numbers, and determining a configuration of a basic part (B1); classifying, as an optional component (Po), the rest of the primary common component among all the components that form the wire harnesses of all the product numbers (S14); extracting, as a secondary common component (Pc2), component groups commonly provided in product numbers among the optional components of which the usage rate is equal to or higher than a predetermined value, and determining a configuration of an additional part (OB); classifying, as an additional component (Pa), each component of the rest of secondary common components among the optional components (S21); and forming the whole wire harness of each product number with a combination of the wire harness of the basic part, the wire harness of the additional part, and the additional component (S22).