An impeller for a centrifugal compressor, the impeller comprising: a hub shaped like a disk; a plurality of blades protruding from a surface of the hub and provided radially, wherein a passage is formed by the hub and a blade being adjacent with the hub, so that a fluid, flowing in along an axial direction at an inner circumferential side in a radial direction, is flowed out toward an outer circumferential side in a radial direction; each of the plurality of blades comprises a main body part and a leading edge (44, 54, 64), the main body part comprising a pressure side and a suction side, the pressure side receiving a pressure from a fluid flowing through the passage which is relatively high, the suction side receiving a pressure from a fluid flowing through the passage which is relatively low, and the leading edge being shaped as a curved surface connecting the pressure side and the suction side at the inner circumferential side in the radial direction; characterized in that an angle between a component central line of the main body part and the axial direction increases from an inner end in the radial direction toward an outer end in the radial direction, the inner end connecting with the hub; and a radius of curvature of a contour line of the leading edge (44, 54, 64) connected to the pressure side and the suction side from a central position which is an intersection between an extended line of the component central line of the leading edge (44, 54, 64) and the contour line of the leading edge, decreases from the inner end toward the outer end, in the cross section of the leading edge_(44, 54, 64) thereby preventing shock losses. a hub shaped like a disk; a plurality of blades protruding from a surface of the hub and provided radially, wherein a passage is formed by the hub and a blade being adjacent with the hub, so that a fluid, flowing in along an axial direction at an inner circumferential side in a radial direction, is flowed out toward an outer circumferential side in a radial direction; each of the plurality of blades comprises a main body part and a leading edge (44, 54, 64), the main body part comprising a pressure side and a suction side, the pressure side receiving a pressure from a fluid flowing through the passage which is relatively high, the suction side receiving a pressure from a fluid flowing through the passage which is relatively low, and the leading edge being shaped as a curved surface connecting the pressure side and the suction side at the inner circumferential side in the radial direction; characterized in that an angle between a component central line of the main body part and the axial direction increases from an inner end in the radial direction toward an outer end in the radial direction, the inner end connecting with the hub; and a radius of curvature of a contour line of the leading edge (44, 54, 64) connected to the pressure side and the suction side from a central position which is an intersection between an extended line of the component central line of the leading edge (44, 54, 64) and the contour line of the leading edge, decreases from the inner end toward the outer end, in the cross section of the leading edge_(44, 54, 64) thereby preventing shock losses.