PRINTED WIRING BOARD

摘要

PROBLEM TO BE SOLVED: To provide a printed wiring board constituted of wiring conductors where pitches are narrowed and density can be made to be high. SOLUTION: The wiring conductors 3 where conductor width is changed to the thickness direction of the wiring conductors have constitutions where the position of the thickness direction of minimal conductor width is that except for a wiring conductor surface layer part 4.