To provide a pen case for a wall hanging calendar by which one can write without looking for a pen when writing a schedule or a memorandum because it has been inconvenient that pen has not been found out when writing the schedule or the memorandum in the wall hanging calendar or when writing in during telephone call.

Magnets are arranged in upper and lower ends of a flexible sheet and a lower center part of a wall hanging calendar is sandwiched by the magnets. The pen is inserted into a sheet part in which the magnet are not arranged. A pen case for the wall hanging calendar is characterized in that a slipping stopper is arranged in the inside of the sheet.