A method of producing a semiconductor device includes the step of forming a through hole in a semiconductor substrate. The semiconductor substrate has a first main surface and a second main surface opposite to the first main surface, and includes a first conductive layer formed on the second main surface. The through hole penetrates through the semiconductor substrate from the first main surface to the second main surface, so that the first conductive layer formed on the second main surface is exposed at a bottom portion of the through hole. The method further includes the steps of forming a seed layer on a side surface of the through hole from the bottom portion of the through hole to the first main surface; forming a second conductive layer on the seed layer through a first plating process; and forming a third conductive layer selectively on the second conductive layer.