the free end of the ring sector 32 the circle f at an enlarged scale the free end of the ring sector 22 is cut out at 50 while the free end of the ring sector 32 is cut out at 50 39 when the turnable ring rod 21 engages the fixed ring rod 31 the cut out 50 is in coincidence with the cut out 50 39 likewise the free ends of the ring sectors 28 and 38 are cut out according to the arrangement as described above giving only a touch to the ring sectors 24 and 26 causes the turnable rods to turn toward the fixed rods so that the turnable ring rods 21 and 25 turn as a result the ring sectors 22 24 26 and 28 all reach the opposite ring sectors 32 34 36 and 38 so that the free ends of the ring sectors 22 and 28 engage the free ends of the ring sectors 34 and 36 the free ends of the ring sectors 22 and 28 are in coincidence with the free ends of the ring sectors 32 and 38 whereby four sets of rings are formed in order to open the binder only a touch is given to the ring sectors 24 and 26 so that the pawl portions 41 and 60 disengage the associated dent portion 41 39 and 61 39 with turning of the ring rods 21 and 25 thus the four rings are opened fig6 illustrates the binder of the present invention which is attached to a file reference numerals 51 52 53 and 54 stand for the cover backbone and backcover of a file and documents kept therein respectively reference numeral 10 indicates the inventive binder attached to the.