Abstract: The present invention provides a connecting configuration in wiring harness assembly or in a junction box used in the wiring harness assembly, wherein a plurality of individual primary wires and branch wires branched therefrom to form sub wiring harnesses are connected to each other per predetermined circuits by connecting means by way of electrically insulating members each made of a sheet or a thin plate covering the joint portions therebetween, which insulating members being piled up in one-on-another form, so that the entire wire connecting configuration can be accommodated in one casing or one box. Since the connecting configuration according to the present invention is constructed as such, minimization, weight saving and integration of a wiring harness assembly or a junction box used therein are all enabled, and alterations including replacement of or addition to the circuits are readily performed.