To improve pumping efficiency by providing an impeller to a rotor held axially with a bearing using Lorentz's force and rotated magnetically, performing blood pumping by the rotation of the rotor and adjusting the position of the rotor with an axial position controller.

A blood pumping device is comprises a stator assembly 1 furnished with a stator crust 3, a spiral vessel 4, a stator liner 6, and the like, and a rotor assembly 2 provided with a rotor supporting sleeve 7, a rotor liner 9, and the like. By the cooperation of a stator magnet array 11 and a rotor magnet array 12, the rotor 2 is held magnetically radially in a floating state. To adjust the axial positional relation between the stator magnet portion and the rotor magnet portion, a position actuator 70 is provided. Furthermore, a magnetic driving device made up of the stator magnet portion and the rotor magnet portion is provided to rotate the impeller 10 of the rotor pump portion and thereby pump blood via a blood route 20'.