PURPOSE: To enable the smooth, continuous transfer of liquid without the agitation of liquid and contact with a driving face by moving magnetic spherical bodies magnetically attracted to a magnetic moving device, in concentric circle in association with the rotation of the magnetic moving device, and rotating an opening/closing member according to this movement.

CONSTITUTION: When the rotary shaft 7 of a magnetic moving device 6 is rotated counterclockwise at constant speed, each magnetic spherical body attracted to a magnet 10 moves counterclockwise in a liquid transfer passage 2. Upon reaching an outlet 4, liquid pressed by the magnetic spherical body 5 is discharged. When the magnetic spherical body 5 passes the outlet pipe 4, an opening/closing member 11 is rotated clockwise so as to move a pressing arm 14 to the right. The return area 1a of an annular tube body 1 is thereby reset to spherical shape. As a result, the magnetic spherical body 5 passes the return area la and moves toward an inlet pipe 3. The following pressing arm 14 presses the return area 1a so as to close it again. Such a cycle of the magnetic spherical body 5 is repeated to force-feed liquid continuously to the outlet pipe 4 from the inlet pipe 3.