A printed wiring board includes a plurality of conductor plates that
includes at least one conductor plate that is used as a lead for
electrical connection with an external circuit, the conductor plates
being separated spatially from one another; an insulating layer formed on
or across the conductor plates or both on and across the conductor
plates; and a plurality of wiring patterns formed on the insulating
layer. At least one of the conductor plates is electrically connected
with at least one of the wiring patterns through a via-hole.