Patent ID: 8922444

Claim:
An antenna device comprising: an antenna coil, the antenna coil comprising: a plate-shaped magnetic core having first and second main surfaces, a length of the plate-shaped magnetic core being larger than a thickness of the magnetic core as measured from the first main surface to the second main surface; and a coil conductor wound around the magnetic core; and a flat conductor adjacent to the antenna coil, wherein the antenna coil is provided at or proximal to an end portion of the flat conductor and on or over a surface of the flat conductor opposite to a surface thereof facing an antenna of a communication partner, a first conductor portion of the coil conductor is adjacent to a first main surface of the magnetic core, a second conductor portion of the coil conductor is adjacent to the second main surface of the magnetic core, and said first and second conductor portions do not overlap each other in a perspective plan view of the magnetic core, the second main surface of the magnetic core faces the flat conductor, and the first conductor portion is closer to the end portion of the flat conductor than the second conductor portion.