Patent ID: 8455765

Claim:
A laminated body, comprising: a circuit wiring portion; a resin layer provided on the circuit wiring portion, the resin layer including a core portion composed of a fiber base member having a thickness of 25 μm or less, the core portion having a center line in a thickness direction thereof, the resin layer having one surface, the other surface opposite to the one surface and a center line in a thickness direction thereof, and the resin layer through which at least one via-hole is adapted to be formed; and a metal layer bonded to at least one of the two surfaces of the resin layer, and the metal layer having at least one opening portion provided so as to correspond to the via-hole to be formed, wherein the center line of the core portion is provided only between the center line of the resin layer and the one surface of the resin layer and no center line of the core portion is provided between the center line of the resin layer and the other surface of the resin layer, wherein the resin layer includes the core portion having one surface and the other surface opposite to the one surface, a first resin layer provided on a side of the one surface of the core portion, and a second resin layer provided on a side of the other surface of the core potion, and wherein in the case where a thickness of the first resin layer is defined as “B 2 (μm)”, a thickness of the second resin layer which is not positioned between the circuit wiring portion and the core portion is defined as “B 1 (um)”, a thickness of the circuit wiring portion is defined as “t 1 (μm)”, a residual copper ratio of the circuit wiring portion is defined as “S (%)”, and a thickness of the second resin layer which is positioned between the circuit wiring portion and the core portion is defined as “t 2 (μm)”, B 1 , B 2 , t 1 and t 2 satisfy a relationship of B 2 <B 1 and B 1 =t 2 +t 1 ×(1−S/100).