Patent ID: 7038143

Claim:
A wiring board comprising: a first conductor formation substrate including a first substrate having a planar surface, and a plurality of first conductors spaced apart and on said planar surface of said first substrate; a second conductor formation substrate including a second substrate, and a plurality of second conductors partially within said second substrate and exposed at a surface of said second substrate, said second conductors and said surface of said second substrate facing said first conductors; and a dielectric interposed between said first and second conductor formation substrates, wherein at least said dielectric is formed by thermo-compression bonding, and said dielectric includes an adherent insulator having a melting point lower than a temperature reached during the thermo-compression bonding of said dielectric, and melts during the thermo-compression bonding, and a dielectric film interposed between said first and second conductors, having a surface subjected to a treatment to improve wettability by the adherent insulator when melted, and having a melting point higher than the temperature reached during the thermo-compression bonding.