Impeller and centrifugal pump

An impeller, disposed in a centrifugal pump comprising a housing having an inlet, an outlet and an impeller chamber, wherein the impeller is disposed in the impeller chamber and rotationally driven by a driving shaft protruding from a casing fixed to the housing, and the impeller comprises:

• a shaft part connected to the driving shaft to rotate about an axis line extending toward the inlet;
• a plurality of blades directly connected to and extending radially from an outer periphery of the shaft part;
• and
• a shroud plate being annular and continuous with the plurality of blades so as to cover a tip side area of the plurality of blades to be disposed adjacent to an inner wall of the housing on an inlet side,
• wherein the plurality of blades are protruded from a surface of the shroud plate and extend along the axis line toward a casing side that is opposite to the inlet side, and a bottom surface of each of the plurality of blades faces an end wall of the casing in which the end wall of the casing faces the inlet side,
• wherein on the side opposite the side where the shroud plate is disposed, the impeller further comprises a disk part extending radially from the shaft part and continuous with the plurality of blades so as to cover a base side area of the plurality of blades.