Patent ID: 7582968

Claim:
A wiring board comprising: an insulating base; a plurality of first conductor wirings aligned in an inner region on the insulating base; second conductor wirings formed on respective side edge portions of the insulating base; bumps formed on the respective first conductor wirings; wherein said forming the concave surface includes joining a stiffener onto a device mounting surface of said organic resin substrate to form a multiple-layered member, and forming said concave surface in said multiple-layered member a protective film that is formed on the insulating base so as to cover the first conductor wirings and the second conductor wirings and has an opening region through which the bumps are exposed; and a protecting sheet being placed on the wiring board, wherein a rear surface of the protecting sheet is in contact with the protective film, the protecting sheet covering the bumps, and a height of the rear surface of the protecting sheet from a surface of the insulating base is greater than a height of the bumps from the surface of the insulating base.