Patent ID: 8632014

Claim:
A wireless IC device comprising: a radiating plate; a wireless IC chip; and a feeder circuit board on which the wireless IC chip is mounted, the feeder circuit board including a feeder circuit that includes a matching circuit which matches characteristic impedances of the radiating plate and the wireless IC chip, the matching circuit including an inductance element, the inductance element being coupled with the radiating plate; wherein the wireless IC chip is interposed between the radiating plate and the feeder circuit board, and the radiating plate and the feeder circuit board are joined to each other via the wireless IC chip; the radiating plate is adhered to an article at a surface of the radiating plate on a side opposite to a side of the radiating plate on which the feeder circuit board and the wireless IC chip are disposed; and the feeder circuit board completely covers the wireless IC chip and at least a portion of the radiating plate such that no portion of the wireless IC chip is exposed to the outside and the wireless IC chip is protected from shock from the outside.