The size of a wireless chip is often determined according to an antenna circuit thereof. Power source voltage or power supplied to the wireless chip can be more easily received with a larger antenna. On the other hand, there has been an increasing demand for a compact wireless chip, and it is thus necessary to downsize an antenna. In view of this, the invention provides a wireless chip capable of data communication with a small antenna, namely a compact wireless chip having an improved communicable distance. A power source circuit of an ID chip of the invention generates a higher power source voltage than a power source voltage generated in a conventional ID chip, by using a boosting power source circuit having a boosting circuit and a rectifier circuit.