A centrifugal blood pump device 1 includes a housing 20, a centrifugal pump section 2 having an impeller 21 which rotates in the housing to send blood by centrifugal force upon rotation, an impeller rotation torque generation section 3 for attracting a magnetic member 25 of the impeller and rotating the impeller 21, and a plurality of grooves for hydrodynamic bearing provided on an inner face of the housing 20 on the impeller rotation torque generation section 3 side. Further, a side wall 52 of each of the grooves for hydrodynamic bearing is formed as an inclined side wall 52 inclined obliquely such that the groove for hydrodynamic bearing is expanded from a bottom face 53 of the groove for hydrodynamic bearing toward an opening face of the groove for hydrodynamic bearing.
