PURPOSE: To efficiently carry-in/out a pallet by constituting the subject device from the pallets superposed vertically in pairs, accommodating shelves for accommodating each pallet, separating mechanism, carrying-in/out mechanisms and a control part.

CONSTITUTION: A pallet 20 is constituted of the upper and lower stages and accommodates the worked members before working and the worked members after working at the same time, and transported into an accommodating shelf 1 by a transport mechanism 10, and can be separated by a separating mechanism 13, and during the time when one pallet is held, the other pallet is carried out by a carrying-out mechanism 15. Therefore, in order to carry out the delivery of the worked piece onto the pallet 20 or the accommodation of the worked articles, the separating mechanism 13 and carrying-in/out mechanisms 10 and 15 are operated at the same time, in interlocking, and the time for the transport processing is shortened. Further, the installation space for the pallet to be accommodated and stored on an accommodating shelf 1 is reduced to the min.