| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it hard to detach a metal plate from a base material.SOLUTION: A wiring board comprises: a first metal plate on a surface of an insulating substrate; a second metal plate 31 on a rear face of the insulating substrate; an interlayer connection part for connecting the first metal plate and the second metal plate; a base material through hole which is provided in the insulating substrate and pierces the insulating substrate in a thickness direction; a through hole which is provided in the first metal plate opposite to the base material through hole and pierces the first metal plate in a thickness direction; a plurality of testing through holes 33 which are provided in the second metal plate 31; and a salient 32 provided on the second metal plate 31 in a region surrounded by the plurality of testing through holes 33. When the salient 32 and the testing through holes 33 are formed on the second metal plate 31, after the testing through holes 33 are formed, the salient 32 is formed by press work by a mold 50 for the hole.</p> |
