Patent ID: 8345438

Claim:
An electronic part module comprising: a wiring substrate having an obverse surface; a passive device group including a plurality of passive devices formed on the obverse surface of the wiring substrate; and at least one device chip mounted on the wiring substrate; wherein the passive devices include a multi-coil inductor, and wherein the multi-coil inductor includes a first spiral coil, a second spiral coil and a connecting portion that connects the first spiral coil and the second spiral coil to each other, and wherein the first spiral coil and the second spiral coil at least partially overlap with each other as viewed in a direction perpendicular to the obverse surface of the wiring substrate, the first spiral coil and the second spiral coil being spaced from each other in the direction perpendicular to the obverse surface of the wiring substrate, with a gap in between the first spiral coil and the second spiral coil, a top surface, a bottom surface, and a side surface of one of the first spiral coil and the second spiral coil being exposed to air.