To arrange pipings for water supply tube to a sprinkler head without generating any dead space on a rack.

With regard to the rack in the present automatic warehouse, front and rear stays 1A, 1B, cross arms 2A, 2B projecting laterally from the front and rear stays 1A, 1B, and shelf supporters 3A, 3B for providing connection between end parts of cross arms 2A, 2B, are provided, and at least ore-side ends of shelf supporters 3A, 3B are so provided as to be positioned in extension outward from the outer surface of the stay 1A and a water supply tube 4 is longitudinally arranged outside of the stay 1A on the side to which shelf supporters 3A, 3B are provided in extension.