A wiring board consists of flat board with the first surface and the second surface , conductor layer with wire , dielectric layer being overlapped alternatively with conductor layer on one of board surface , connecting through conductor , signal through hole and its conductor , protective hole and its conductor , the first and the second path terminal pads . It is featured as forming signal transmission path by setting conductor layer on one of board surface, forming coplanar wave guide with constant impedance 20 or strip line by surface conductor and wire, covering protective hole internal surface with its said conductor.