| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board which has high strength in a connection between a connection part of the wiring board and an electronic component or an external circuit board.SOLUTION: In a wiring board 10, a connection part 1A is provided on a main surface of an insulation substrate 1. The connection part 1A includes: a first metal layer 2 that is provided on the main surface of the insulation substrate 1; a first insulation coat layer 4 coating an outer peripheral part of the first metal layer 2; a second metal layer 3 adhering to an area ranging from a center part of the first metal layer 2 to a surface of the first insulation coat layer 4; and a second insulation coat layer 5 coating an outer peripheral part of the second metal layer 3. The first and second metal layers 2, 3 and the first and second insulation coat layers 4, 5 are securely bonded to each other and heat stress is dispersed. These features inhibit mechanical destruction in the connection part 1A etc. |
