To provide a calendar information display medium in which a user can simply customize display of a calendar according to his/her schedule, further processing such as memorandum and seal attachment is possible also to the customized part, which is user-friendly, and the designability of an original article is not impaired even when it is customized by the user.SOLUTION: A calendar information display medium displays calendar information including date information, day of week information, etc., and comprises on a substrate 1: a color printing part 5 in which at least the date information of the calendar information is printed by a color ink; and a concealment printing part 6 laminated on the color printing part 5 and in which the calendar information is printed in a similar shape as that of the color printing part 5 by a concealing ink which discharges and changes color under a specific condition.SELECTED DRAWING: Figure 2