To enhance working efficiency by instantly displacing a plurality of cases with empty cases after automatically successively loading small parts in the plurality of cases.

A rotary plate 5 is installed on a geared motor 3 provided in a body 1. The installing shaft 7 of each case-mounting table 6 having a back board 6A at its rear part is turnably inserted in the rotary plate 5 at equally spaced intervals on the concentric circle of the rotary shaft 5. Where, the front end of each installing shaft 7 is secured to the upper center of each back board 6A at its rear surface. One end of a joint stay is secured to the rear end of each installing shaft 7. The other end of each joint stay is turnably connected to a ring joint plate 12 on its concentric circle. The front surface of the body 1 is provided with one or more stoppers 14 coming into contact with the inner boundary edge or outer boundary edge of each joint plate 12 at both the sides sandwiching the vertical center line of each joint plate 12.