To double the delight of reading and to improve knowledge, settling problem that a bookmark of two-leg formation with a projection having a notch groove in the center of the main body to be so used as to bestride pages and hold them between makes an unsuitable appearance, because the portion of an advertisement is always displayed on the occasion of reading or carrying, and that it does not enable attainment of the knowledge even when a favorite expression such as some animal with projections at the top is selected and used.

A cut 3 is made from the lower part of the central part of the main body toward the top to an extent of about three quarters in the middle, and by using the cut that makes the bookmark bestride the pages. The bookmark is prevented from falling, while the part above the cut is made to have characteristically the effect of a mark as the projection. Boring 4 is made in the end of the cut so that the bookmark may be hardly broken on the occasion of being inserted. The opposite sides of the cut of the main body of the bookmark as the boundary carry the portion 1 of a question and the portion 2 of an answer.