To solve the problem that the so-called flat file or pipe file of a conventional type to be operated by inserting a binding shank into a binding hole of sheets, has such a disadvantage that whenever an objective sheet found halfway through a batch of filed sheets, is removed or a new sheet is inserted halfway through the filed sheets, these procedures cannot be performed, unless the other sheet found right over the sheet to be removed or the location of a new sheet to be inserted, is once removed from the file, and thus the frequent replacement of the sheets is very troublesome.

This loose-leaf binder has a binding shank which is of a double structure that its members are a binding guide with a flat section and a binding shank tube 84 into which the former is inserted. The binding shank guide is slid into a binding hole 85 from a slit open groove of a sheet P4 with the slit open groove, and the binding shank tube 84 is placed to cover the binding shank guide so that the binding shank cannot slip out of the binding hole 85. Thus, the filing of the sheet P4 can be achieved.

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