Centrifugal pump

A centrifugal pump comprising:

• a rotating blade member including an impeller member and a rotor magnet associated with the impeller member;
• a main body casing in which the rotating blade member is accommodated;
• a coil portion that rotates the rotating blade member, wherein the coil portion is located on a periphery of the rotor magnet;
• an axial member which is associated with the main body casing, wherein the rotating blade member pivots around the axial member;
• and
• a bearing portion associated with the impeller member, wherein the axial member is disposed in the bearing portion and is supported by the bearing portion,
• wherein the axial member includes a first end portion and a second end portion in an axial direction of the axial member,
• the first end portion is disposed at a rotor magnet side in the main body casing, and the axial member is fixed at the first end portion,
• the second end portion of the axial member is not fixed in the main body casing,
• the main body casing forms a fluid introducing passage, and is associated with a blade casing in which the rotating blade member is accommodated,
• the bearing portion associated with the impeller member has a third end portion in an axial direction of the bearing portion, and the third end portion protrudes from an inner periphery opening portion of the blade casing into the fluid introducing passage.