An axial flow fan (70) having blades (91) in which recessed parts (101) that are recessed toward the leading edge are formed on the trailing edge, with stress-reducing parts (105), having an R shape at the positive-pressure-surface side and the negative-pressure-surface side in a cross-sectional view of the blades (91), being formed at the edge part of the leading-edge side of the recessed parts (101).