One aspect of the present invention can include a conductor to be installed on a vehicle for high current use including a stranded copper wire connected to an end portion of a single-core aluminum cable, an intermediary conductor made of copper is connected to the stranded copper wire, and an end face of a core of the single-core aluminum cable is cold welded connected to an end face of a welding shaft formed on the intermediary conductor having approximately a same diameter as the core of the single-core aluminum cable.