AIR-BLOWING DEVICE

A blower fan (40) includes a plurality of blades (42) radially extending from a boss (41) provided at the rotary center and spaced apart from each other in the rotational direction, and a ring portion (43) connecting outer peripheral ends of the blades (42) in a ring shape. An inner peripheral wall surface of an end part (34) on an air-flow downstream side of a cylindrical portion (31) is disposed on the outside in a radial direction of the rotary shaft in the blower fan (40), with respect to an end part on the air-flow downstream side of the ring portion (43). The end part (34) on the air-flow downstream side of the cylindrical portion (31) is positioned outward in the radial direction of the rotary shaft, as toward the air-flow downstream side. Thus, the blower can prevent the backflow air from being swirled, thereby reducing noise.