Patent ID: 7378596

Claim:
A flex-rigid wiring board comprising: a rigid substrate having an opening and a conductive layer; an electroless plated layer formed on an inner surface of the opening of the rigid substrate and electrically connected to the conductive layer of the rigid substrate; an electro plated layer formed on the electroless plated layer and filling the opening of the rigid substrate; a flexible substrate having a conductive layer including an interconnecting electrode pad; an insulative adhesive interposed between the rigid substrate and flexible substrate and lap-joining the rigid substrate and the flexible substrate; and a conductor lump formed on the electro plated layer, penetrating the insulative adhesive, and electrically connecting the conductive layer of the rigid substrate and the interconnecting electrode pad of the flexible substrate, wherein an area where the rigid and flexible substrates overlap each other is 40% of or smaller than 40% of a total surface area of a surface side, which opposes to the flexible substrate, of the rigid substrate.