The present invention provides a card case that can prevent skimming, when a noncontact IC card is sent to a card user from an issuer of it, or carried by the card user. Since metal films, which shield from an electromagnetic wave, are provided in a card main body, it makes prevention of skimming possible, when the noncontact IC card is sent to the card user from the card issuer. The card user peels off a peeling the section by taking off the seal of openings from an adhesive section, and then insert the card main body having the exposed the adhesive section into a card storing section formed in his wallet or commuter pass holder. As a result, skimming of the IC card can be prevented even when it is carried by the card user in his wallet or the commuter pass holder.