WIRING BOARD

摘要

A first wiring layer includes a differential transmission line pair (12). A second wiring layer (8) includes a conductor region (18). A second insulating layer is provided between the wiring layer and the second wiring layer (8). The second wiring layer (8) contains, in a conductor region (18), a non-conductive region (20) having plane symmetry with respect to the plane of symmetry (50) of the differential transmission line pair in the wiring layer. Here, a plurality of non-conductive regions (20) are positioned on the second wiring layer (8), and these regions are formed contiguously on the plane of symmetry (50) of the differential transmission line pair (12).