A card case accommodates a card or the like in a hollow portion formed as a result of attachment of a cover member to a bottom member. The cover member has such a structure as to allow reversal of its opposite sides in its attachment to the bottom member. Reversal of the opposite sides of the cover member changes the depth of a planar recess portion of the cover member, the planar recess portion partially constituting the hollow portion. Accordingly, the card case can cope with encapsulation of cards of different thicknesses.

A grading system includes a sever computer installed in a management company and a client computer owned by a client and connected to the server computer via a network. Through use of the client computer, a client requests the sever computer to appraise and register a card. The management company appraises the card received from the client and stores an appraisal result and information regarding the client in an IC chip as card information. Subsequently, the management company returns the card and the IC chip to the client.