Abstract: A filing device provided with a binding element (12) including a file-mounting side edge (16)and a binding portion (18) in the form of a foldable bag adjacent thereto, as well as with a sliding element (14) slidably inserted into the binding portion (18) is disclosed, in which the binding portion (18) is provided in its longitudinal direction with notched guiding grooves (24) spaced apart from each other at a predetermined distance for inserting binder rods (22) from outside and with binding holes (26) adjacent to the grooves (24), while the sliding element (14) is provided in its longitudinal diection with engaging protrusions (28) spaced apart from each other at a predetermined distance for closing and opening the notched guiding grooves (24) of the binding holes (26) and with notched engaging grooves (30) adjacent ot the protrusions (28), said sliding element (14) being further provided at its both ends with stoppers (32) for engaging both ends of the binding element (12) and for limiting the sliding eleme