A centrifugal blood pump reliably prevents blood from entering between an impeller and a shaft member. Pump 1 includes a pump chamber 24, a housing 2 including a blood inlet 25 and a blood outlet 26, an impeller 3 as a centrifugal force applying member rotatably encased in the pump chamber 24 and applying a centrifugal force to the blood Q by the rotation of the impeller 3. A support mechanism 4 supports impeller 3 rotatably with respect to the housing 2. The support mechanism 4 includes a rod-shaped shaft member 41 disposed at the rotation center of the impeller 3. Shaft member 41 and the impeller 3 are formed integrally with each other, as by insert molding.
