To provide a document folder capable of being used as a book stand as well, which is very easy to use in two usage patterns, with a simple structure, and which has a price capable of being sold at a low-priced goods shop.

A lid member 20, held in a manner that it can slide along the upper side edges of a storage box body 10, can be pivotally turned over, so that the inner surface of the lid member 20 covering the storage box body 10 can face outside. Then, the reversed lid member 20 is supported by a support plate 30 stood up in the storage box body 10. When the lid member 20 is supported by the support plate 30, a support space S is provided between the lower end of the lid member 20 and the storage box body 10.