| 摘要 |
A through hole 7 is a vertical hole. With respect to a plane including a center line CL of the through hole 7, when focusing on each region on either side of the center line CL, let a line segment connecting a first point X1 corresponding to the edge of an opening 10a of an insulating layer 10 and a second point X2 corresponding to the edge of a second opening 7b be a first line segment S1, let a line segment connecting the second point X2 and a third point X3 corresponding to a point at which the second opening 7b and a surface 10b of the insulating layer 10 intersect be a second line segment S2, and let a line segment connecting the third point X3 and the first point X1 be a third line segment S3. Then, a first area A1 of the insulating layer 10 positioned on one side with respect to the first line segment S1 is greater than the sum of a second area A2 of the insulating layer 10 surrounded by the first line segment S1, the second line segment S2, and the third line segment S3 and a third area A3 of the insulating layer 10 positioned on the other side with respect to the third line segment S3. |
