Patent ID: 7737366

Claim:
A multilayer printed wiring board comprising: a multilayered structure comprising a plurality of conductor circuit layers and a plurality of interlaminar insulative layers, the conductor layers having at least one conductor circuit portion, the interlaminar insulative resin layers including an outermost interlaminar insulative resin layer forming an outermost layer of the multilayered structure; a filled-viahole formed in the outermost interlaminar insulative resin layer and comprising at least one metal plating filling and completely closing a hole formed through the outermost interlaminar insulative resin layer, the metal plating of the filled-viahole extending out of the hole and having a substantially flat surface, the filled-viahole electrically connected to the conductor circuit portion in the conductor circuit layers; and a solder bump formed on the substantially flat surface of the filled-viahole.