The disclosed structure (10) is provided with: at least three conductors (111, 131, 151) which face one-another; a through-via (101) which passes through each of the conductors (111, 131, 151); openings (112, 152) which are provided so as to surround the circumference of the through-via (101); and conductor elements (121, 141) which are located in different layers to those in which the conductors (111, 131, 151) are located, and which are connected to the through-via (101). Facing opening 112 is conductor element 121, which is larger than said opening (112), and facing opening 152 is conductor element 141, which is larger than said opening (152).