A printed wiring board includes conductive layers, resin insulation layers, a through-hole conductor penetrating through one or more insulation layers and having a first-surface-side and second-surface-side lands, a first-surface-side signal line formed on one of the insulation layers and connecting the first-surface-side land and a conductive layer on the insulation layer, and a second-surface-side signal line formed on one of the insulation layers and connecting the second-surface-side land and a conductive layer on the insulation layer. The conductive layers include a first-surface-side conductive layer formed over the first-surface-side land such that the first-surface-side conductive layer has a solid pattern having an opening corresponding to the first-surface-side land and formed concentric with the first-surface-side land, and a second-surface-side conductive layer formed over the second-surface-side land such that the second-surface-side conductive layer has a solid pattern having an opening corresponding to the second-surface-side land and formed concentric with the second-surface-side land.