Noncontact communication medium including an antenna coil that is formed on a substrate having a through-hole

A noncontact communication medium comprising:

• an antenna coil that is formed on a substrate having a through-hole and induces power with application of a magnetic field from an outside;
• and
• a processing circuit that operates using the power induced by the antenna coil,
• wherein the processing circuit is inserted in the middle of the antenna coil,
• the antenna coil is wound in a loop shape along an outer periphery of the substrate,
• an outer peripheral end of the antenna coil is connected to the through-hole, and
• a portion of the antenna coil on the substrate facing a position of the through-hole has a shape recessed to an inner peripheral side of the antenna coil in a winding direction,
• wherein the portion of the antenna coil facing the position of the through-hole is a plurality of conductive wire portions, and
• the plurality of conductive wire portions have a shape along the longer side of the antenna coil that is recessed to the inner peripheral side in the same shape and with the same degree, and are offset at regular intervals from an outer peripheral side to an innermost peripheral side in the winding direction of the antenna coil.