PURPOSE: To house an article to be housed compactly and to easily perform taking in and out by arranging racks with moving vehicle in front and back lines on a floor on which a vehicle guide groove is provided in the forward/ backward direction, respectively, arranging the racks smaller than the racks in the back line on the floor in the front line, and moreover, providing a vehicle guide groove in the right and left directions on the floor in the front. line.

CONSTITUTION: A floor plane 1 is formed by connecting plural floor bases 2, and the rack 3, for example, four racks of same shape are neighbored to each floor base 2 in the back line. Also, three racks 4 of same shape are neighbored to the floor base in the front line. The floor base 2 at a left terminal part is set as a space 5 equivalent to one rack. Every one guide groove 6 of a moving vehicle is provided in the forward/back direction at the right and left sides of each floor base, and a pair of guide grooves 6 are formed on the forward/backward floor plane along the right and left directions. When the rack 4 neighboring to the space part 5 is moved in the right and left directions, the part after moving the rack 4 is formed as the space part, which enables the rack 3 in the back line to be drawn out. Also, the rack at a right terminal can be drawn out by moving whole racks in the front line to the left side.