Patent ID: 7554039

Claim:
An electronic device comprising: an interposer substrate having a core metal, a wiring layer and an insulating layer formed on each side of the core metal, and having one side of the core metal as a first side in which a semiconductor chip is mounted and the other side of the core metal as a second side, and a motherboard having a metal plate, a wiring layer and an insulating layer formed on at least one side of the metal plate, and having the interposer substrate which is mounted on the one side of the metal plate, wherein: an area where the one side of the metal plate is exposed by partially removing the insulating layer formed on the motherboard; a part of a solder joint pad formed on the insulating layer on the second side of the interposer substrate is joined to a pad formed on an exposed area on the one side of the metal plate of the motherboard with a first solder bump, and a part of a solder joint pad on the second side of the interposer substrate is joined to a pad formed on the insulating layer on the one side of the metal plate of the motherboard with a second solder bump.