Multilayered printed circuit board and manufacturing method therefor

A multilayered printed circuit board comprising: a substrate (330) on which a conductive circuit (334) is formed; an interlayer insulating resin layer (350) formed on the conductive circuit (334); an opening (348) for forming a via hole (360) formed in the interlayer insulating resin layer (350); and another conductive circuit (358) including a via hole (360) and formed on the interlayer insulating resin layer (350), wherein the surface of the conductive circuit (334) is subjected to a coarsening process using etching solution containing cupric complex and organic acid, and stripe pits and projections are formed on the inner wall of the opening (348) for forming the via hole (360).