There is a need to improve reliability of the semiconductor device.A semiconductor device includes a printed circuit board and a semiconductor chip mounted over the printed circuit board. The semiconductor chip includes a pad, an insulation film including an opening to expose part of the pad, and a pillar electrode formed over the pad exposed from the opening. The printed circuit board includes a terminal and a resist layer including an opening to expose part of the terminal. The pillar electrode of the semiconductor chip and the terminal of the printed circuit board are coupled via a solder layer. Thickness h1 of the pillar electrode is measured from the upper surface of the insulation film. Thickness h2 of the solder layer is measured from the upper surface of the resist layer. Thickness h1 is greater than or equal to a half of thickness h2 and is smaller than or equal to thickness h2.