Patent ID: 8653381

Claim:
A wiring board comprising: a first wiring; a second wiring being disposed adjacently to the first wiring in a plane direction of the wiring board; a third wiring being disposed adjacently to the first wiring in a thickness direction of the wiring board; a fourth wiring being disposed adjacently to the third wiring in the plane direction of the wiring board; and an insulating layer being formed between the first wiring and the second wiring, between the first wiring and the third wiring, between the second wiring and the fourth wiring and between the third wiring and the fourth wiring, wherein the second wiring and the fourth wiring are disposed adjacently to each other in the thickness direction of the wiring board, the first wiring and the fourth wiring are not overlapped in the thickness direction of the wiring board, the second wiring and the third wiring are not overlapped in the thickness direction of the wiring board, a first crest and a first trough are provided on a side face of the first wiring in an area where the first wiring is adjacent to the second wiring, a second crest and a second trough are provided on a side face of the second wiring in the area where the first wiring is adjacent to the second wiring, the first trough provided on the side face of the first wiring and a part of the third wiring are overlapped in the thickness direction of the wiring board, and the second trough provided on the side face of the second wiring and a part of the fourth wiring are overlapped in the thickness direction of the wiring board.