An axial fan comprising: a hub to which a central shaft is coupled; and a plurality of blades coupled to the hub to rotate, wherein each one of the blades comprises: a hub connection part defining an inner end of the blade, the hub connection part being coupled to an outer circumferential surface portion of the hub; a tip defining an outer end of the blade; a first wing part extending from the tip in an inner radial direction; and a second wing part extending from the first wing part towards the hub, the first and second wing parts (130, 140) being configured to slope with respect to a plane perpendicular to the central shaft, wherein the hub has a cylindrical shape, and the hub comprises: a front surface portion facing a discharge direction; a rear surface portion facing an air blow direction; and an outer circumferential surface portion defining an outer circumference of the cylindrical shape, wherein each blade comprises a boundary portion that divides the first wing part from the second wing part, and each blade is bent at the boundary portion such that the second wing part extends from the boundary portion radially inwards more towards the front surface portion of the hub than a radially inwards virtual extension of the first wing portion from the boundary portion, wherein each blade further comprises: a leading edge defining a front end in a rotation direction; and a trailing edge defining a rear end in the rotation direction, wherein the boundary portion comprises: a first end formed at the trailing edge; and a second end formed at the leading edge, and wherein an angle by which the blade is bent at the second end is greater than the angle by which the blade is bent at the first end, and wherein a pitch angle (β 1, β 2, β 3) of each blade gradually increases from the tip toward the hub along the first wing part, the pitch angle being an angle of a chordwise extending part of the blade with respect to the plane perpendicular to the central shaft. a hub to which a central shaft is coupled; and a plurality of blades coupled to the hub to rotate, a hub connection part defining an inner end of the blade, the hub connection part being coupled to an outer circumferential surface portion of the hub; a tip defining an outer end of the blade; a first wing part extending from the tip in an inner radial direction; and a second wing part extending from the first wing part towards the hub, the first and second wing parts (130, 140) being configured to slope with respect to a plane perpendicular to the central shaft, wherein the hub has a cylindrical shape, and the hub comprises: a front surface portion facing a discharge direction; a rear surface portion facing an air blow direction; and an outer circumferential surface portion defining an outer circumference of the cylindrical shape, a front surface portion facing a discharge direction; a rear surface portion facing an air blow direction; and an outer circumferential surface portion defining an outer circumference of the cylindrical shape, wherein each blade comprises a boundary portion that divides the first wing part from the second wing part, and each blade is bent at the boundary portion such that the second wing part extends from the boundary portion radially inwards more towards the front surface portion of the hub than a radially inwards virtual extension of the first wing portion from the boundary portion, a leading edge defining a front end in a rotation direction; and a trailing edge defining a rear end in the rotation direction, wherein the boundary portion comprises: a first end formed at the trailing edge; and a second end formed at the leading edge, and a first end formed at the trailing edge; and a second end formed at the leading edge, and wherein an angle by which the blade is bent at the second end is greater than the angle by which the blade is bent at the first end,