To provide a taking forgetting prevention myriad year calendar in which taking forgetting of a medicine can be prevented, and whether to have taken the medicine or not can be confirmed.

A taking forgetting prevention myriad year calendar includes: a month display part 81 in which a month letter is displayed to be freely changed; a day of a week display part 82 in which a day character is displayed to be freely line-changed; and a date display part 83 in which a date character is displayed, and includes: a holding member 5 of one plate shape having a front plate part 2 and a back plate part that sandwich a PTP sheet 1 including a packaging sheet having an accommodation part 11a of a medicine y and a cover sheet sealing the opening part side thereof, in which a front window part 21 and a rear window part are disposed to be penetrated at a corresponding position of a closed state to be folded such that the front plate part 2 and the back plate part are overlapped, and that is made to be a free opening and closing to a closed state and an open state by a thin hinge portion 4; a lock means 6 that holds the holding member 5 in a closed state; and a medicine extrusion member 7 that has a hemisphere convex shape part that presses the accommodation part 11a exposed to the front window part 21 to discharge the medicine y through the back window part.