| 摘要 |
A method of fabricating a printed-wiring board, includes: forming a through-hole across a thickness of a printed-wiring board, the forming of the through-hole including forming a first opening part having a first diameter, forming a second opening part having a second diameter, and forming a third opening part provided between the first opening part and the second opening part, wherein the second diameter is larger than the first diameter, and the third opening part is formed in a tapered shape whose diameter decreases toward the first opening part from the second opening part.
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