LIQUID FEEDING PUMP

PROBLEM TO BE SOLVED: To feed liquid stably with liquid in a completely shut out state from outside as well as preventing the damage and the like of the liquid by feeding the liquid fed from an input port to an output port by a movable body moved in an annular flow passage. SOLUTION: A spherical body 14 is moved in a flow passage 11 while rotating on its own axis, and thereby, blood fed from an input opening 3a of an input port 3 into the flow passage 11 flows from an input flow passage 12 into the flow passage 11, and then, it is discharged from an output opening 4a of an output port 4 to outside through an output flow passage 13 after the blood flows in the flow passage 11. The blood discharged rate from the output port 4 corresponds to moving speed of the spherical body 14. In this case, since the blood in the flow passage 11 is moved and discharge while pushing by a spherical outer peripheral surface of the spherical body 14, receiving of shearing force is reduced, and it is suppressed to generate heamolysis and the like of the blood. It is thus possible to supply the liquid stably as well as to prevent the damage of the liquid or heating.