Coupling structure and antenna module

A coupling structure for coupling a first substrate and a second substrate to each other, the coupling structure comprising a first substrate and a second substrate, wherein

• the first substrate includes a first dielectric and a first electrode,
• the second substrate includes a second dielectric and a second electrode, the second dielectric including a plurality of laminated dielectric layers,
• the first electrode is electrically coupled to the second electrode,
• the second dielectric includes a first surface and a second surface that are perpendicular to a lamination direction of the second dielectric,
• the second dielectric holds the first dielectric, part of the first dielectric being located between the first surface and the second surface, and
• the first electrode has a first recess an area of which overlaps the second electrode in plan view in the lamination direction, such that the first electrode extends downward in the lamination direction while extending inward into the second substrate.