To provide an analysis device that can easily indicate whether a wrong mount of a container storage rack relative to a rack reception cradle is present. An analysis device comprises: a plurality of container storage racks that can store containers in a state having the plurality of containers arrayed; and a rack reception cradle that can mount a plurality of container storage racks. In the plurality of container storage racks, a first engagement part for the container storage rack so as to take any of a first posture or second posture different from the first posture when the container storage rack is mounted to the rack reception cradle is formed at a different position in each container storage rack, and in the rack reception cradle, a second engagement part is formed that engages with the first engagement part formed in the container storage rack, and allows the container storage rack to be mounted in the first posture.