A reticle rotatable rack is provided at an upper position, and a pod rotatable rack is provided at a lower position in a clean stocker. A clean gas is supplied downwardly. In the stocker, a pod transportation device and a reticle transportation device are elevated and lowered. Load ports, a pod opener, and the pod rotatable rack are connected by the pod transportation device. The pod opener and the reticle rotatable rack are connected by the reticle transportation device.