PURPOSE: To reduce storage area and simplify appurtenant facilities in such a way that it provides a material storage at the first stage and a moving type material storage at the second stage which moves over the storage and opens the space for taking out materials at the first stage to the optional position.

CONSTITUTION: Since a material storage 2 at the first stage has tracks 3 for supporting and moving a material storage 1 at the second stage at both corners and in the center, and width of the storage 2 is divided into two parts, ordinary materials which are shorter than the track intervals are put in two lines, to boot, since the upper part is covered by the storage 1 at the second stage, when materials 8 are put, the storage 1 at the second stage is moved, output spaces 5 for the materials 8 are opened seriatim from the corners to the upper part of the storage 2 while the materials 8 are put down from these spaces 5 and juxtaposed, the materials can be held in all the place of the storage 2 at the first stage.