The invention provides an impeller capable of reducing the noise due to turbulence vortexes produced in the vicinity of the main plate of the impeller, and provides a low-noise multiblade blower. A multiblade blower (40) consists mainly of an impeller (63), a casing (11) covering the impeller (63), and a motor (14) for rotating the impeller (43). The impeller (43) comprises a plurality of blades (33) fixed in the outer peripheral edge of a main plate (61) in the form of a circular plate, the blades (33) being connected together at their other ends by an annular side plate (62). Interblade portions (65) between the blades (33) on the main plate (61) are cut at their front portions as seen in the direction of rotation. These interblade portions (65) are greater than the circumferential thickness of the blades (33) and are cut to such a length that they do not reach the rear of the other blades (33) that are adjacent the front as seen in the direction of rotation. Further, the radial portions of the interblade portions (65) are cut along the shape of the blades (33) to a length extending from the outer peripheral edge to the inner peripheral edge. |