Patent ID: 8379400

Claim:
An interposer mounted wiring board comprising: a wiring board, a main body of which is made of resin, which has a first surface and a first wiring layer at the first surface, and which has a second surface opposite to the first surface and a second wiring layer at the second surface; a first interposer, a base member of which is made of silicon, which has first through-hole electrodes and first pads connected to the first through-hole electrodes, which is mounted on the first surface of the wiring board in a manner that at least one of the first pads is electronically connected to the first wiring layer via a bump, and which has a value of a coefficient of thermal expansion, the value being equal or close to a value of a coefficient of thermal expansion of a first electronic component to be mounted thereon; and a second interposer, a base member of which is made of silicon, which has second through-hole electrodes and second pads connected to the second through-hole electrodes, which is mounted on the second surface of the wiring board in a manner that at least one of the second pads is electrically connected to the second wiring layer via a bump, and which has a value of a coefficient of thermal expansion, the value being equal or close to a value of a coefficient of thermal expansion of a second electronic component to be mounted thereon, wherein the first interposer and the second interposer are arranged respectively at positions facing each other with the wiring board interposed therebetween, and underfill resins are filled between the first interposer and the first surface of the wiring board, and between the second interposer and the second surface of the wiring board, respectively.