Abstract: A binder for a document capable of providing excellent usability and workability by improving so that only the advantages of a conventional lever arch type ring binding implement can be utilized to increase the opening of a ring. The binding implement comprises a base part, the ring mounted on the base part and changeable between a closed attitude for binding the document and an open attitude in which the closed ring is partially opened to bind the document, and a switching mechanism mounted on the base part and switching the ring between the closed attitude and the open attitude. The ring comprises a first ring member and a second ring member brought into the open attitude and the closed attitude by the contact of the end parts thereof with each other or the separation of the end parts thereof from each other. The switching mechanism comprises a select lever swingably fitted to the base part.

Abstract: A binder for a document, comprising a base part, rings fitted to the base part and allowed to change in a closed ring attitude for biding the document and an open ring attitude for opening parts of the closed rings to pass the document therethrough before winding, and a switching mechanism fitted to the base part and switching between the closed ring attitude and the open ring attitude. The switching mechanism further comprises a switching lever swingably fitted to the base part. When the rings are in the open ring attitude, the switch mechanism is set so that the switching lever is allowed to pass through the open portion of the ring. Thus, the binder for the document with easiness of handling and excellent workability can be provided by improving so that only the advantages of a conventional ring type binder and a lever arch type binder can be utilized.