Kyocera Corporation

Tsuyoshi Sunada

Hidetoshi Yugawa

A wiring board of the present disclosure includes: a first insulating layer including a surface; a second insulating layer including un upper surface and a lower surface and locating above the surface of the first insulating layer; a wiring conductor layer formed on the surface of the first insulating layer, includes a via land; and a via hole conductor penetrating from the upper surface to the lower surface of the second insulating layer. The via hole conductor includes a via bottom being in contact with the via land. Crystal grains in the via bottom are smaller than crystal grains in the via land.

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Satsumasendai, Japan

Tsuyoshi Sunada