To easily perform classification and display and also to easily perform change of classification and to prevent display from being deteriorated even in the case of frequently extracting and inserting sheet papers.

An opened display window 6 is formed on the surface of one side of a pair of clipping pieces 2, 3 which are relatively turnably connected. A rotary drum 7 on which a plurality of sorting information positioned opposite to the display window 6 is written is arranged on the back side thereof. A display changeover means 8 is provided in other clipping means and the rotary drum 7 is turned at a prescribed angle by the display changeover means 8 when both clipping pieces 2, 3 exceed a prescribed range and are relatively turned.