PURPOSE: To improve storing efficiency and carrying efficiency and also reduce equipment cost.

CONSTITUTION: A plurality of cages 2 are mounted in two lines front and back as seen from a traveling passage 2 and along a traveling passage 3. The cages 2 stored in front and an inner part both storing spaces are detachably coupled by a coupler. A shifting device 13 for shifting a pallet P or the cage 2 between the front storing space and a carrying truck 6 is mounted in the carrying truck 6 traveling on the traveling passage 2. The front cage 2 is drawn to the carrying truck 6 in a coupled state with the storing space of inner part, when carrying the cage from the storing space of the inner part and the cage 2 of the inner part, is moved to the front storing space.