To provide a stacking device that is miniaturized.

After moving a supporting member 6 to the side lower than a supporting position by a second moving mechanism, the supporting member 6 is moved to the upper side by the second moving mechanism. Thereby, containers C set to a container set part 4 are supported by the supporting member 6 at the supporting position, and the supporting member 6 supporting the containers C is moved to an upper edge position by the second moving mechanism. By repeating this, the supporting member 6 supporting the containers C stacked in two lines and five steps is moved to an upper end position. Then, after each container set part 4 is moved from a set position to a retreat position by a first moving mechanism 5, the supporting member 6 supporting the containers C stacked in two lines and five steps is moved to a lower end position by the second moving mechanism, and the containers C stacked in two lines and five steps are mounted on a carriage V set in a carriage set part.