To solve problems of inconvenience that small office supplies such as rubber bands, clips and thumbtacks are put in respective cases, are awkward to use and cannot be put together in a single case.

This storage device is so formed that round, square or elliptical cases are provided with slots and the cases are stacked by using joint implements or poles for connecting the cases to the slots. A stand is attached with weights or a suction cup. This storage device has many cases stackable into the tower to store the rubber bands, the clips, the thumbtacks and the like in dedicated cases respectively and further, is a vertical type to occupy just a small space. In use, a content is easily taken out by turning a case using a joint as a fulcrum. The cases are detached and used individually to be very convenient.