To solve a problem that since there are 1-1 form, 1-N form, and a multiple form in the harnesses and these various types of harnesses are produced by a dedicated machine, therefore according to an order, the machine for 1-N form becomes idle and the machine for multiple form is in full operation, and that it is not suitable for a set delivery by a combination of various types of harnesses.

The length of wires 3 is measured and the measured wires 3 are clamped by a clamper and are driven into and welded to the right and left connectors 8, 8'one by one each right and left or by every two or more pieces. By moving the connectors 8, 8' and by changing the striking positions, various types of harnesses are produced by one unit machine, thereby a cell type system enabling delivery of necessary harnesses by one day is realized.