Provided is an axial fan including: a rotor blade; a base portion placed on a rotation axis of the rotor blade and on a downstream side in an air-blowing direction of the rotor blade; and an outer frame portion where the rotor blade and the base portion are housed, wherein the base portion includes an inclined portion in an end portion, on the downstream side in the air-blowing direction, of the base portion, the inclined portion reducing in diameter toward the downstream side in the air-blowing direction, the inclined portion includes opening portions and hollow ribs, the opening portions are placed at predetermined intervals in a peripheral direction of the inclined portion, and each of the hollow ribs surrounds a peripheral part on an outer side of each of the opening portions, sticking out from the inclined portion toward the downstream side in the air-blowing direction along the rotation axis.