Patent ID: 7592626

Claim:
A capacitor comprising: a lower electrode formed of a foil made of a polycrystalline metal; an upper electrode layer; and a dielectric layer disposed between the lower electrode and the upper electrode layer, wherein: the lower electrode has a top surface facing the dielectric layer, and has grain boundaries of the polycrystalline metal appearing at the top surface; the upper electrode layer has a bottom surface facing the dielectric layer; and the dielectric layer has a bottom surface facing the top surface of the lower electrode, and a top surface facing the bottom surface of the upper electrode layer, the capacitor further comprising a resin insulator that is disposed between the top surface of the dielectric layer and the bottom surface of the upper electrode layer and that is present only in part of a region in which the top surface of the dielectric layer and the bottom surface of the upper electrode layer face each other, wherein the resin insulator is disposed to cover at least part of the grain boundaries appearing at the top surface of the lower electrode when seen from above the top surface of the dielectric layer.