A control unit includes a plurality of electronic components; and at least two metal busbars disposed along each other. Each of the at least two metal busbars establishes an electrical connection between the electronic components and includes a magnetic-material portion. The at least two metal busbars are arranged to cause the magnetic-material portion of one of the at least two metal busbars to have magnetic poles generating a magnetic force substantially in the same direction as that of the magnetic-material portion of another of the at least two metal busbars which is adjacent to the magnetic-material portion of the one of the at least two metal busbars.