Patent ID: 8389871

Claim:
A multilayered wiring board having a stack structure multilayered by alternately stacking a plurality of conductor layers and a plurality of resin insulation layers including a same resin insulation material as a primary component, a plurality of first main surface side connecting terminals arranged in a first main surface side of the stack structure, a plurality of second main surface side connecting terminals arranged in a second main surface side of the stack structure, the plurality of conductor layers formed in the plurality of resin insulation layers and operably connected to each other through via conductors tapered such that diameters thereof are widened toward the first main surface side or the second main surface side, wherein a solder resist is provided on at least one of the first main surface side and the second main surface side of the stack structure, a plurality of openings are formed in an outermost resin insulation layer that contacts with the solder resist, the plurality of the first main surface side connecting terminals or the plurality of the second main surface side connecting terminals being made of a copper layer as a main component and positioned in the plurality of the openings, connecting terminal outer surfaces being positioned inwardly from an outer surface of the outermost resin insulation layer, and the solder resist extends into the plurality of openings and makes contact with an outer circumference portion of each of the terminal outer surfaces.