To provide a centrifugal type blood pump apparatus generating reduced hemolysis in a pump apparatus rotating an impeller in non-contact with a housing using a dynamic pressure groove.

This centrifugal type blood pump apparatus 1 includes an impeller 21 having a magnetic substance 25 and sending liquid by being rotated in the housing 20, an impeller rotation torque generating part 3 for attracting and rotating the magnetic substance 25 of the impeller 21, and a dynamic pressure groove 38 provided on the inside face of the housing 20 in the impeller rotation torque generating part side. The dynamic pressure groove 38 satisfies that the groove depth related value (a) (a=h1/h2) calculated from a distance h1 between the impeller 21 in the dynamic pressure groove part in the impeller rotation and the housing, and a distance h2 between the impeller in a dynamic pressure groove non-presence part and the housing is 1.5-2.5; and the groove width related value (s) (s=Bo/B) calculated from the sum B (B=Bo+B1) of a dynamic pressure groove non-presence part width B1 between the width Bo of the circumferential edge part of the dynamic pressure groove and the circumferential edge of a dynamic pressure groove adjacent thereto, and the width Bo is 0.6-0.8.

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