To facilitate the movement in/out of a building, to sufficiently expand a storage part in the vertical direction, and to cope with rain and sun shine.

All movable shelves 20, 20A group are in a non-use posture 10 which the movable shelves are densely stored indoors by forcibly moving the movable shelves 20, 20A group inward of the building, and the movable shelves 20, 20A group are forcibly moved toward an outdoor space 8 to switch the non-use posture to the use posture in which a passage is formed between the movable shelves 20, 20A. The movable shelves 20, 20A of at least on the forward side are carried into the outdoor space 8 to increase the arrangement area of the movable shelves 20, 20A group. Articles 17 to be stored in the movable shelves 20, 20A in the outdoor space 8 are prevented from rain and sunshine by a movable roof member 40 located above the movable shelves 20, 20A of the outdoor space 8.