MULTILAYER PRINTED WIRING BOARD AND MOUNTING BODY USING THE SAME

摘要

A multilayer printed wiring board (11) is composed of a plurality of printed wiring boards (21a, 21b) having wiring formed on the front layer, and a relaxing connecting layer (15), which connects the printed wiring boards (21a, 21b) to each other and has a inorganic filler, a thermosetting resin and a relaxing material for relaxing internal stress. The multilayer printed wiring board has a small warping quantity by eliminating internal stress generated by heating and cooling due to solder reflow and the like, by means of the relaxing connecting layer (15) arranged on the inner layer.