Patent ID: 8811031

Claim:
A multichip module comprising: a base substrate including a core substrate having wiring layers on each of a top surface and a bottom surface; a wiring board disposed on the base substrate and having a wiring pattern; an adhesive sheet comprising an adhesive sheet main body with a plurality of holes and conductive resin, each of the plurality of holes being filled with the conductive resin so that the conductive resin within the each of the plurality of holes performs as a via, wherein the adhesive sheet is configured to bond the base substrate to the wiring board while maintaining an electrical connection between the base substrate and the wiring board; and a plurality of chips connected to a surface of the wiring board, the surface being opposite the adhesive sheet, wherein, assuming that α is a coefficient of thermal expansion of the wiring board, β is a coefficient of thermal expansion of the base substrate, and γ is a coefficient of thermal expansion of the adhesive sheet main body, the relationship α≦γ≦β is satisfied.