Patent ID: 7002080

Claim:
A multilayer wiring board comprising: a core portion including a core insulating layer containing a carbon fiber material; a first lamination wiring portion bonded to the core portion and having a laminated structure including at least a first insulating layer and a first wiring pattern, the first insulating layer containing glass cloth; and a second lamination wiring portion bonded to the first lamination wiring portion and having a laminated structure including at least a second insulating layer and a second wiring pattern; wherein the core portion, the first lamination wiring portion and the second lamination wiring portion are arranged in a stack; and wherein the core insulating layer, the first insulating layer and the second insulating layer have respective thermal expansion coefficients defined in a surface-spreading direction transverse to a stacking direction of these three layers, the thermal expansion coefficient of the core insulating layer being smallest among said three layers, the thermal expansion coefficient of the second insulating layer being largest among said three layers, the thermal expansion coefficient of the first insulating layer being larger than that of the core layer but smaller than that of the second insulating layer.