Multilayer wiring board

摘要

A multilayer wiring board (50) including a core board which comprises a resin baseplate (10) outer wiring patterns (12) on one and the other sides of the core board (10), respectively, and throughholes (44) penetrating the core board and having a side wall coated with a conductive material (46) electrically connecting the outer wiring patterns with each other, wherein a space within the throughholes is filled with a filler material (48) having a thermal expansion coefficient substantially equal to that of the resin baseplate (10).