A semiconductor device includes a substrate having a plurality of electrodes and a plurality of leads that are connected to the electrodes and a semiconductor element that is mounted on the substrate. The semiconductor element has a rectangular shape including a long side, a short side, and a corner portion, and has bumps connected to the electrodes. An underfill is filled between the substrate and the semiconductor element and extends on the substrate around the semiconductor element. An overcoat covers the leads on the substrate. At least one of the plurality of leads that is connected to the electrode corresponding to the bump arranged nearest to the corner portion along the long side of the semiconductor element has at least two successive bent portions that are bent in the same direction and is laid out toward the short side of the semiconductor element in a plan view.