. . . "As a result, there is a problem that it is likely to cause the corrosion of theextraction wiring 7a.In order to suppress the generation of the corrosion, in this exemplary embodiment, a relationship between the opening area of the first contact hole 10a and the opening area of the second contact hole 10b is specified such that the corrosioncaused in the second contact hole 10b for the testing term" .