To prevent wear caused by heat generation in a shaft of a pump section and thereby prevent a pump from falling into malfunction.
The pump includes: a pump section with an impeller for sucking and discharging fluid, and a motor section for rotationally driving the pump section, wherein a central boss section 231 of a rotor of the pump section is integral with a pump rotating shaft 26 of a cylindrical shape; the pump rotating shaft 26 is rotatably supported at both ends thereof by bearings 27, 28 of cylindrical shape; ends of the pump rotating shaft 26 have forms of a convex section 262 and a concave section 263; the bearings 27, 28 are formed of the same member as that of the pump rotating shaft; and slide-contact sections 100 between the pump rotating shaft 26 and the bearings 27, 28 are formed by rotatably inserting the convex sections 262 into the concave sections 263.
Mitsuo Tanaka
Yasuo Shibata