Patent ID: 8183465

Claim:
A component built-in wiring substrate comprising: a core substrate, which is formed of a resin, including a core principal surface, a core rear surface, and a housing hole portion having an opening on the core principal surface side; a plate-shaped component, which is formed of a ceramic material, that has a component principal surface and a component rear surface and is housed in the housing hole portion in a state in which the core principal surface and the component principal surface are disposed to face a same side; a resin filling portion that is filled in a gap between an inner wall face of the housing hole portion and the plate-shaped component and that fixes the plate-shaped component to the core substrate; and a wiring stacking portion that is formed by alternately stacking resin interlayer insulating layers and a conductive layer on the core principal surface and the component principal surface and that has a plurality of solder bumps disposed inside a mounting area for mounting a chip component configured on the uppermost layer, wherein, when viewed from the core principal surface side, the projected area of the mounting area is larger than the projected area of the plate-shaped component and the resin filling portion, and the plate-shaped component and the resin filling portion are positioned directly below the mounting area, and wherein a value of the coefficient of thermal expansion (CTE α 2 ) for a temperature range that is equal to or higher than the glass transition temperature of the resin filling portion is set to be larger than a value of the coefficient of thermal expansion of the plate-shaped component for said temperature range and is set to be smaller than the value of the coefficient of thermal expansion of the core substrate for said temperature range.