A blower fan comprising: a hub coupled to a driving member and configured to receive rotation force; and a plurality of wings (120, 120A, 120B, 120C) radially arranged along a circumference of the hub, wherein each of the plurality of wings (120, 120A, 120B, 120C) includes an uneven part (130, 130A, 130B, 130C) formed at a trailing edge which is a rear edge portion of the wing (120, 120A, 120B, 120C) with respect to a rotational direction thereof, the uneven part (130, 130A, 130B, 130C) comprising a plurality of protruding portions (131, 131A, 131B, 131C) protruding from a surface of the trailing edge and a plurality of recessed portions (132, 132A, 132B, 132C) recessed from the surface of the trailing edge; and a tail wing part (140, 140A) formed at the trailing edge having a convex portion (142, 142A) with a convex shape to have a preset curvature which is formed on an outer side of the uneven part (130, 130A, 130B, 130C), wherein the convex portion (142, 142A) protrudes further backward than the protruding portions (131, 131A, 131B, 131C) of the uneven part (130, 130A, 130B, 130C) with respect to the rotational direction of the blower fan, characterized in that the plurality of protruding portions (131, 131A, 131B, 131C) and the plurality of recessed portions (132, 132A, 132B, 132C) are alternately arranged, the plurality of protruding portions (131, 131A, 131B, 131C) have a same sized shape, and the plurality of recessed portions (132, 132A, 132B, 132C) have a same sized shape, and the plurality of protruding portions (131, 131A, 131B, 131C) and the plurality of recessed portions (132, 132A, 132B, 132C) have a symmetrical shape with each other with respect to the surface of the trailing edge. a hub coupled to a driving member and configured to receive rotation force; and a plurality of wings (120, 120A, 120B, 120C) radially arranged along a circumference of the hub, wherein each of the plurality of wings (120, 120A, 120B, 120C) includes an uneven part (130, 130A, 130B, 130C) formed at a trailing edge which is a rear edge portion of the wing (120, 120A, 120B, 120C) with respect to a rotational direction thereof, the uneven part (130, 130A, 130B, 130C) comprising a plurality of protruding portions (131, 131A, 131B, 131C) protruding from a surface of the trailing edge and a plurality of recessed portions (132, 132A, 132B, 132C) recessed from the surface of the trailing edge; and a tail wing part (140, 140A) formed at the trailing edge having a convex portion (142, 142A) with a convex shape to have a preset curvature which is formed on an outer side of the uneven part (130, 130A, 130B, 130C), an uneven part (130, 130A, 130B, 130C) formed at a trailing edge which is a rear edge portion of the wing (120, 120A, 120B, 120C) with respect to a rotational direction thereof, the uneven part (130, 130A, 130B, 130C) comprising a plurality of protruding portions (131, 131A, 131B, 131C) protruding from a surface of the trailing edge and a plurality of recessed portions (132, 132A, 132B, 132C) recessed from the surface of the trailing edge; and a tail wing part (140, 140A) formed at the trailing edge having a convex portion (142, 142A) with a convex shape to have a preset curvature which is formed on an outer side of the uneven part (130, 130A, 130B, 130C), wherein the convex portion (142, 142A) protrudes further backward than the protruding portions (131, 131A, 131B, 131C) of the uneven part (130, 130A, 130B, 130C) with respect to the rotational direction of the blower fan, characterized in that the plurality of protruding portions (131, 131A, 131B, 131C) and the plurality of recessed portions (132, 132A, 132B, 132C) are alternately arranged, the plurality of protruding portions (131, 131A, 131B, 131C) have a same sized shape, and the plurality of recessed portions (132, 132A, 132B, 132C) have a same sized shape, and the plurality of protruding portions (131, 131A, 131B, 131C) and the plurality of recessed portions (132, 132A, 132B, 132C) have a symmetrical shape with each other with respect to the surface of the trailing edge.