Patent ID: 8173907

Claim:
An interposer comprising: a first insulating layer comprising an inorganic material and having a first land, a second land and a first wiring electrically connecting the first land and the second land; and a second insulating layer formed over a first surface of the first insulating layer and having a second wiring, a second pad for loading a second electronic component over the second insulating layer and a first via conductor electrically connecting the second land and the second wiring, wherein the first wiring and the second wiring electrically connect the first land and the second pad, the first land and second land are positioned such that a first electronic component is mounted over a second surface of the first insulating layer on an opposite side of the first surface and the second wiring has a longer wiring length and a greater thickness than the first wiring, and the first land has a diameter which is equal to or greater than a diameter of the first via conductor.