Patent ID: 8617688

Claim:
A multilayer printed wiring board having interlayer connection via hole parts and a conductive layer circuit, wherein the via holes are filled with a conductive paste comprising flake conductive fillers having a 99% cumulative particle size of 25 Î¼m or less and a binder resin as essential components, the flake conductive fillers being metal particles having a silver-copper alloy surface layer, wherein the conductive paste has a viscosity ratio (Î· 0.5 /Î· 2.5 ) of 0.7 to 2.0, the flake conductive fillers have an average particle diameter in the range of 1 Î¼m to 4 Î¼m, and a part of the flake fillers in the conductive paste are fused with a part of the conductive layer circuit.