摘要:
A printed wiring board has a metal layer, a resin structure having a first resin layer portion formed on a first surface of the metal layer, a second resin layer portion formed on a second surface of the metal layer, and a filler resin portion filling an opening portion of the metal layer, a first circuit formed on the first resin portion, a second circuit formed on the second resin portion, and a through-hole conductor formed through the first resin, filler resin and second resin portions and connecting the first and second circuits. The through-hole conductor has a first portion narrowing from the first circuit toward the second resin portion and a second portion narrowing from the second circuit toward the first resin portion, and the first portion is connected to the second portion at a connected position shifted from the middle point of the thickness of the metal layer.