Patent ID: 8921705

Claim:
A wiring board comprising: a frame; a plurality of wiring sub boards positioned inside an area defined by the frame and each comprising a multilayer printed wiring board comprising a rigid core, at least one resin insulating layer formed on the rigid core, and at least one wiring layer formed on the resin insulating layer, the multilayer printed wiring board having a first conductive pattern on a first surface of the wiring sub board and a second conductive pattern on a second surface of the wiring sub board on an opposite side of the first surface, said plurality of sub boards not electrically connected to one another; a first insulating layer formed over the wiring sub boards and the frame such that the first insulating layer is continuously extending from the frame to the wiring boards and covering a boundary portion between the frame and the wiring sub boards and a boundary portion between the wiring sub boards on one side of the frame; and a second insulating layer formed over the wiring sub boards and the frame such that the second insulating layer is continuously extending from the frame to the wiring sub boards and covering the boundary portion between the frame and the wiring sub boards and the boundary portion between the wiring sub boards on an opposite side of the frame, wherein each of the first insulating layer and the second insulating layer has no conductive wiring pattern formed directly on the frame, the first insulating layer comprises an insulating material and has a via hole in which a first conductor comprising a plating material is formed such that the first conductor is electrically connected to the first conductive pattern through the via hole in the first insulating layer, the second insulating layer comprises an insulating material and has a via hole in which a second conductor comprising a plating material is formed such that the second conductor is electrically connected to the second conductive pattern through the via hole in the second insulating layer, and the boundary portion between the frame and the wiring sub boards and the boundary portion between the wiring sub boards are filled with the insulating material derived from at least one of the first insulating layer and the second insulating layer such that said plurality of sub boards are not electrically connected to one another.