To provide a calendar which enables a user of the calendar to freely make the calendar indicate a date, and which enables the diverse use of a message group with the same pattern, described on a second sheet.

In this block calendar where two sheets are repeelably bonded together, a date indication-predetermined space for indicating the date on a monthly basis is formed on the first sheet by making a cut in at least a part of a peripheral edge, and a proper message to be indicated is described on the second sheet in such a manner as to correspond to the date formed on the first sheet. When the date indication-predetermined space formed on the first sheet is peeled along the cut, the proper message described on the second sheet is exposed in an peeled opening.