A stocker includes a transporter that travels through a traveling space within a stocker and transports an article, a pair of rails that flank the traveling space extend in parallel or substantially in parallel in a horizontal direction, platforms movable along the pair of rails, and a housing provided on a stocker outer side of a door that separates an inside and an outside of the stocker, and that houses the platforms. The pair of rails extend from the inside of the stocker to the housing through an opening directly under the door. At least one of the platforms includes a fence in an upright standing manner and an upper end of the fence is higher than an upper end of the opening. The platform that includes the fence extends across the inside of the stocker and the outside of the stocker via the opening while the fence is arranged on a stocker inner side.