A sample storage, in which barcodes and two-dimensional codes written on the outer surface of the sample storage can be read correctly without false recognition. A storage tube 110 is made of transparent material, comprising a top opening. An externally equipped opaque writable element 120 is assembled outside by covering storage tube 110 throughout from the bottom surface to the side surface. An externally equipped opaque writable element 120 is to be used as a medium to which coded information that can be read by means of optical reading is written. The top opening of the storage container 110 is sealed by the lid element screwed into or fitted into the externally equipped opaque writable element 120 not to the storage container 110. At least one window 125 is provided, which enables a sample 200 contained to be observed, with the externally equipped opaque writable element 120 assembled outside. The horizontal friction generated in the lid element screwing process is blocked and the vertical pressing force is transmitted efficiently by the slide plate 140.