PRINTED CIRCUIT BOARD

摘要

PROBLEM TO BE SOLVED: To provide a printed circuit board having a via hole with improved electrical connection reliability.SOLUTION: A printed circuit board includes: a first insulating layer 210; a pad 211 formed on the first insulating layer 210; a second insulating layer 220 covering the first insulating layer 210 having the pad 211 thereon; and a via hole 221 formed in the second insulating layer 220. The via hole 221 formed in the second insulating layer 220 has a bottom surface on the pad 211, which is a non-planar surface having an uneven shape.