Patent ID: 7902678

Claim:
A semiconductor device comprising: a wiring board in which electrode pads are formed on a surface thereof; a semiconductor element which is disposed on the wiring board and in which electrodes are formed on the surface thereof; bumps for connecting said electrodes to said electrode pads; said bumps being formed from solder; and an underfill resin filled between said wiring board and said semiconductor element to embed said bumps, wherein said wiring board comprises a solder resist disposed on the surface of the side on which said electrode pads are formed; wherein apertures for exposing said electrode pads are formed on the solder resist; wherein the thickness of said solder resist in the area excluding the area directly above said electrode pads is equal to or greater than the thickness of said underfill resin disposed on said solder resist in said area between said wiring board and said semiconductor element, wherein the solder resist overlaps the electrode pads in a solder mask defined structure when viewed from a direction normal to the surface of the wiring board, and wherein the volume of said bumps is less than the volume of said apertures.