Provided is a movable rack unit for taking in and out a storage object with respect to a storage space. The movable rack unit includes a guide part including a track member linearly laid inside the storage space and along a depth direction of the storage space and a moving body that moves along the track member. A support member is rotatably borne on the moving body, and the support member supports the storage object within the storage space. Further, this unit includes a rotation guiding part, and the rotation guiding part changes the attitude of the support member in accordance with the position of the moving body with respect to the track member. When the moving member reaches an opening portion side of the storage space, the rotation guiding part rotates the support member so that merely the support member is set outside the storage space.