An assembled structure includes a metal plate having a first main surface and a second main surface, and having a through hole, as well as a resin member assembled with the metal plate and disposed on the second main surface side so as to have a portion fitted within the through hole. Assuming that an opening when the through hole is viewed in a plan view has a first width at a point along the opening and a second width measured in parallel to the first width at a point shifted toward the outer side of the opening, a combination of the first width and the second width can be determined such that the second width is larger than the first width.