There is provided an IC tag, including a substrate made of a dielectric material, an antenna pattern disposed on a surface of the substrate, a communication circuit chip connected to one end and other end of the antenna pattern on the substrate surface, which performs transmission processing and/or reception processing of a radio signal, and external circuit connection parts connected to the antenna pattern in a vicinity of the one end and the other end thereof on the surface or a rear surface of the substrate, in which a conductive part having a predetermined area opposes to other conductive part having a predetermined area on an opposed surface at an opposite side of the substrate, and the conductive part on the opposed surface at the opposite side is formed as a pad to be connected to an external circuit.