A non-contact IC card includes an information storage unit for storing
information, a communication controller for controlling communication with
an external device, and a loop antenna for transmitting and receiving a
radio wave to and from the external device. The non-contact IC card
further includes a changeover switch for changing a communication distance
between the external device and the card, so that the cost and size of the
card can be reduced. The non-contact IC card can be used both in a
long-distance mode and in a contact mode, which ensures high security.
