PURPOSE: To make it possible to transfer fluid even mixed with foreign object, by rotating a cylindrical impeller having therein a plurality of blades and fitted in a bearing, with the bearing serving as a support point and the impeller serving as a force point.

CONSTITUTION: A cylindrical impeller in which a plurality of blades bent or twisted at a predetermined angle are provided is fitted on a bearing B, and is rotated with this bearing serving as a support point and the impeller serving as a force point. Then, fluid is transferred with the use of propulsion produced in the impeller. With this arrangement fluid is sucked toward the rotary center of the impeller, producing vortex stream, and is then discharged. Accordingly, fluid in which solid substances are mixed may be transferred.