An axial flow fan is provided wherein an amount of dropping at the inflection point appearing in air volume - static pressure characteristics may be reduced and noise may also be reduced as compared to conventional axial fans.
A blade (5) has a curved portion (4). The curved portion (4) is formed in the vicinity of a radially outer end portion (5B) positioned opposite to the base portion (5A) in the radial direction of the peripheral wall portion of the hub. The curved portion is convex in the rotation direction (RD), concave in the direction opposite to the rotation direction (RD), and extends along the radially outer end portion (5B) of the blade (5). The curved portion extends from a rear end edge (5C) of the blade (5) positioned on a side where one end (5Aa) of the base portion (5A) of the blade is positioned and extending in the radial direction of the hub to the vicinity of a front end edge (5D) of the blade (5) positioned on a side where the other end (5Ab) of the base portion (5A) of the blade (5) is positioned and extending in the radial direction.