<p>A blower capable of reducing noise and increasing efficiency by improving the structure of the blades thereof used, for example, for the outdoor unit of an air conditioner. The blower comprises an impeller (1) having the multiple sheets of blades (3) fitted to the outer peripheral surface of a boss (2) at specified intervals in the circumferential direction. The trailing edge of the blade (3) comprises a projected part (30) curved at its radial center part so as to be swelled to a suction side. By this constitution, the discharge speed of a gas can be uniformized along the radial direction of the blades (3) to reduce the noise and increase the efficiency.</p>
