Impeller for centrifugal fan and centrifugal fan

The utility model provides an impeller for a centrifugal fan and the centrifugal fan, wherein the impeller for the centrifugal fan has a high property and can be put into mass production easily. The impeller (10) for the centrifugal fan comprises a discoid main plate (31), a plurality of blades (51) and a ring-shaped external diameter ring (61); the impeller (10) rotates in the rotation direction (R), inhales the air above, and blows the air out to the side part; the main plate (31) is arranged in a roughly horizontal manner; each blade (51) is arranged above the main plate (31) in the circumferential direction of a rotation axis namely axis (71) served as the center, and each blade (51) is connected with the external diameter ring (61); the external diameter ring (61) is connected with the rear edge part (51b) of each blade (51), and the part near to the rear edge part (51b) of each blade (51) bends to the rotation direction (R).