To provide a centrifugal pump generating few thrombi by providing a constitution to flow blood in a housing without hindrance or a centrifugal pump reduced with hemolysis reactions by suppressing blood damage of the flood flowing into the housing as much as possible.

This pump has a pump blade 17 rotatably housed along a horizontal surface within the housing 2 provided with an inflow port 11a and an outflow port 13a to feed liquid from the inflow port 11a to the outflow port 13a by rotation. An impeller 3 having a magnetic means 15 on a lower part is formed into a blade or a cap-like shape having the blade, is supported on a spherical surface by only one portion, and has a magnetic means 15 arranged on a lower outer peripheral part. A driving means 1 to rotate the impeller 3 via the magnetic means 15 has a magnetic rotation part 8 arranged on a side of the impeller 3 to rotate the magnetic means 15, and an uplift prevention magnetic means 9 of the impeller 3 to attract the magnetic means 15 is provided on a lower part of the impeller 3.