A curved portion is formed at a corner portion between a shroud and a positive pressure surface of each of a plurality of blades. The curved portion has a curvature that decreases from a suction port or the vicinity of the suction port toward a corresponding one of discharge ports. The curved portion includes a curved surface that is concave in a direction of rotation of the fan and forms a part of the positive pressure surface. The curved portion raised inwardly into an airflow path so that a shortest distance between the outer peripheral portion of a hub and a portion of the curved surface in the vicinity of the shroud may gradually decrease toward the corresponding one of the discharge ports.