| 摘要 |
The wiring substrate 10 includes an insulating layer 13, a wiring 19, a bonding layer provided on such portion of the upper surface 13A of the insulating layer 13 as corresponds to the forming area of the wiring 19, and a seed layer 16 interposed between the bonding layer and wiring 19. The wiring substrate 10 further includes a Ni-Cu alloy layer 15 serving as the bonding layer.
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