An impeller for a recessed impeller type centrifugal pump, comprising: - a disc, - a plurality of vanes which extend from said disc, - a central body, adapted for connection to a rotating shaft, wherein each one of said vanes has a profile with a double curvature: - a first curvature with respect to a sectional plane that is parallel to said disc, - a second curvature with respect to a sectional plane that is perpendicular to the one of said disc, said first curvature and said second curvature having their concavity directed toward the inside of said impeller, said vanes being equidistant and each one of said vanes extending between: - a first end, which is arranged at said central body and is at least partially monolithic therewith, - a second end, which is arranged at the external circumference of said disc, each one of said vanes comprising an inside curve being the surface of the vane that is directed toward the central body and an outside curve being the surface of the vane that is opposite the inside curve, the inside curve and the outside curve having different curvatures: - both when considering a sectional plane that is parallel to said disc, - and when considering a sectional plane that is perpendicular to said disc, characterized in that each one of said vanes comprises a terminal portion, which is opposite with respect to said disc, said terminal portion protruding from said inside curve of said vane toward the inside of the impeller, at least starting from a region that is proximate to the second end, the region of said terminal portion that protrudes from said inside curve having substantially an extension, locally, in a direction that is perpendicular to the tangent to said inside curve, in the point of said inside curve that is furthest from said disc, considering a sectional plane that is perpendicular to said supporting disc. - a disc, - a plurality of vanes which extend from said disc, - a central body, adapted for connection to a rotating shaft, - a first curvature with respect to a sectional plane that is parallel to said disc, - a second curvature with respect to a sectional plane that is perpendicular to the one of said disc, said first curvature and said second curvature having their concavity directed toward the inside of said impeller, said vanes being equidistant and each one of said vanes extending between: - a first end, which is arranged at said central body and is at least partially monolithic therewith, - a second end, which is arranged at the external circumference of said disc, - a first end, which is arranged at said central body and is at least partially monolithic therewith, - a second end, which is arranged at the external circumference of said disc, each one of said vanes comprising an inside curve being the surface of the vane that is directed toward the central body and an outside curve being the surface of the vane that is opposite the inside curve, the inside curve and the outside curve having different curvatures: - both when considering a sectional plane that is parallel to said disc, - and when considering a sectional plane that is perpendicular to said disc, - both when considering a sectional plane that is parallel to said disc, - and when considering a sectional plane that is perpendicular to said disc, characterized in that each one of said vanes comprises a terminal portion, which is opposite with respect to said disc, said terminal portion protruding from said inside curve of said vane toward the inside of the impeller, at least starting from a region that is proximate to the second end, the region of said terminal portion that protrudes from said inside curve having substantially an extension, locally, in a direction that is perpendicular to the tangent to said inside curve, in the point of said inside curve that is furthest from said disc, considering a sectional plane that is perpendicular to said supporting disc.