To reduce cost required for printing.

In a leaf printed matter 65 that has a rectangular shape of A4 size, micro-perforation is formed along a center line 63 bisecting the leaf printed matter 65 into two surfaces of A5 size. Binding holes 61 are formed at positions symmetrical with respect to the center line 63 near the center line 63. Trimmed ruled lines 64 in a pattern, in which level differences appear repeatedly on the side of the center line, are printed in order to camouflage the perforation after cutting-off on both sides of the center line 63. A monthly bulletin 62 of a calendar is printed with the center line 63 as an upper side on each of the surfaces of A5 size bisected by the center line 63. The monthly bulletins 62, obtained by bisecting one leaf printed matter 65 along the perforation, are used as a desktop calendar by being suspended to be replaceable from two rings of the desktop leaf base having a ring binder on its top surface.