A wiring substrate includes an insulating layer having a first surface on which a projecting part is formed, and an electrode pad being formed on the projecting part and including a first electrode pad surface and a second electrode pad surface on a side opposite to the first electrode pad surface. The first electrode pad surface is exposed from the projecting part of the insulating layer. The second electrode pad surface is covered by the insulating layer. A cross-section of the projecting part is a tapered shape. One side of the cross-section toward the first electrode pad surface is narrower than another side of the cross-section toward the first surface of the insulating layer.