| abstract |
[PROBLEMS] To suppress the occurrence of swelling of a conductor layer when subjected to a thermal history at a high temperature in a reflow process or the like while applying a dielectric material containing aromatic liquid crystal polyester and dielectric ceramic particles as an insulating layer. To provide a multilayer substrate. In a multilayer substrate including a plurality of insulating layers, an inner conductor layer provided between adjacent insulating layers, and an outer conductor layer provided as an outermost layer, the insulating layer is a fragrance. The inner conductor layer 3 and the outer conductor layer 7 contain at least one of Cu and Ag, and the inner conductor layer contains a metal element whose standard free energy of formation of oxide is smaller than that of Cu. 3 is provided with protective layers 31, 32, and 33 that cover both surfaces of 3 and the surface of the outer conductor layer 7 on the insulating layer 5 side. [Selection] Figure 1 |