Disclosed herein is an antenna device that includes a magnetic body having a through hole, and a coil pattern including a first winding part and a second winding part overlapping the through hole of the magnetic body. The through hole of the magnetic body includes first and third inner peripheral edges each including a section extending in a first direction and positioned opposite to each other and second and fourth inner peripheral edges each including a section extending in a second direction perpendicular to the first direction and positioned opposite to each other. The second winding part includes an inner peripheral side part wound along the first to fourth inner peripheral edges and an outer peripheral side part positioned outside the inner peripheral side part and wound along the second to fourth inner peripheral edges without being along the first inner peripheral edge.