Patent ID: 8541694

Claim:
A multilayer wiring board comprising: at least one basic material layer and at least one constraining layer stacked on each other; a conductor pattern disposed on or inside at least one of the at least one basic material layer or the at least one constraining layer, the conductor pattern extending in a surface direction in which the at least one basic material layer and the at least one constraining layer extend; and a via-hole conductor extending inside at least the at least one basic material layer in a direction in which the at least one basic material layer and the at least one constraining layer are stacked, the via-hole conductor being connected to the conductor pattern; wherein the via-hole conductor includes a via body and an extended portion, the via body is connected to an intermediate conductor pattern disposed inside the at least one basic material layer such that portions of a single one of the at least one basic material layer are disposed on both sides of the intermediate conductor pattern in a stacking direction of the at least one basic material layer and the at least one constraining layer, and the extended portion is defined by the via body being extended in a direction towards the at least one constraining layer and away from the via body, and the extended portion is connected to the intermediate conductor pattern; and an end of the extended portion of the via-hole conductor is not directly electrically or physically connected to any conductor pattern and is in direct contact with a surface of the at least one constraining layer.