Rfid tag set, rfid tag and rfid tag component

An RFID tag is constructed by pasting a first component and second component together. The first component may include a tabular first base made of dielectric and a metal layer covering one of the front and back of the first base. The second component may include a sheet-like second base, a metal pattern provided on the second base and electrically connected to the metal layer of the first component to constitute a communication antenna, a circuit chip connected to the metal pattern which carries out a radio communication through the communication antenna, and an adhesive material layer which bonds the second base to the other of the front and back of the first base. The metal layer of the first component and the metal pattern of the second component are electrically connected by the conductive component.