To provide a propeller fan for use in an outdoor unit or the like of an air conditioner, obtaining sufficient strength while achieving weight reduction and material saving.

A propeller fan 1 includes a plate-like boss mounting plate 110, and a plurality of blades 200A, 200B, and 200 radially arranged at equal spaces on the outer peripheral edge of the boss mounting plate 110. A base end 201 of the blade has a portion projecting to the windward from the boss mounting plate 110 and a portion projecting to the leeward, and connecting walls 300A and 300B are provided to connect the projecting portions, the base end 201 and the boss mounting plate 110.