An automated warehouse includes: a storage shelf; a mobile body including a base; a first arm supported by the base; a second arm supported by the base; and a movable portion capable of causing an article to move between the mobile body and a first transport mechanism and between the mobile body and a second transport mechanism. In a state where the mobile body is located at a first transfer position, the support position of the second arm is fixed and the support position of the first arm is changed depending on a length of the article in a first direction. Alternatively, in a state where the mobile body is located at a second transfer position, the support position of the first arm is fixed and the support position of the second arm is changed depending on the length of the article in the first direction.