To shorten the whole length, protect a current-carrying cable to a motor part by effectively using a constituting member, and restrain heat generation.

In the axial core part of a cylindrical pump casing 1, by fixing a motor stator 5 to a hollow main shaft 2 arranged and fixed in the axial line direction of the pump casing, by fixing a motor rotor 8 facing a stator 5 to the inner peripheral surface of a motor frame 7 which is rotatably supported by the fixed hollow main shaft 2 through a bearing 6 and concentrically arranged in the pump casing 1, and by adhering a pump impeller 10 on the outer peripheral surface of the motor frame 7, an outer rotor type motor part A is formed.