| 摘要 |
A non-contact IC card is provided with an unauthorized access indicator (7). This unauthorized access indicator (7) judges that a radio wave making an access to an IC chip (1) without following a predetermined procedure is an unauthorized access. When the IC chip (1) judges that it receives an authorized access, it causes a light emitting diode (8) packaged in a card body (4) to emit light and illuminate a window (9) of an optical color changing material formed in the card surface. As a result, the color of the window (9) changes, so that the card owner can recognize at a glance that card receives an unauthorized access unknowingly when the owner takes out the card from the bag or the like. Therefore, after having recognized the reception of the unauthorized access, the owner can take the necessary procedure promptly to ask a reissue or the like of the card.
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