Disclosed is a mold-BGA-type semiconductor device which has: a semiconductor chip which includes insulating resin film formed on at least a part of the surface of the semiconductor chip except a pad; a conductive layer formed in a region on the insulating resin film, the region including at least part corresponding to a position where a solder ball is mounted; a first metal thin wire which is wire-bonded between the pad and the conductive layer; a second metal thin wire which is wire-bonded on the conductive layer; resin part which seals the semiconductor chip, the resin part including a hole to expose part of the second metal thin wire; and 