A propeller fan (5; 25) comprising: a hub including a side surface around a center axis; and a plurality of blades disposed on the side surface of the hub, wherein the blades each include a blade surface part, which is extended from a base end connected to the side surface of the hub to an outer edge, and the blade surface part includes an inner peripheral part, which is positioned on the base end side, and an outer peripheral part which is positioned on the outer edge side, an inner peripheral blade (15; 35), which extends from the side surface of the hub toward the outer edge side, is formed on a positive pressure surface of the blade surface part at the inner peripheral part of each of the blades, the inner peripheral blade (15; 35) includes a plurality of blade elements (15a, 15b; 35a, 35b) that project from the positive pressure surface of the blade surface part toward a positive pressure side, and are arranged side by side in a rotation direction of the blade, and the blade elements (15a, 15b; 35a, 35b) include a first blade element (15a; 35a), which is arranged on a front edge (12-F) side in the rotation direction of the blade, and a second blade element (15b; 35b), which is arranged to be adjacent to the first blade element (15a; 35a) on a rear edge (12-R) side in the rotation direction of the blade, a first opening (16; 36), which passes through the blade surface part from a negative pressure side toward the positive pressure side, is provided between the first blade element (15a; 35a) and the second blade element (15b; 35b) on the blade surface part, and the propeller fan being characterised in that when an apex projecting from the positive pressure surface of the first blade element (15a; 35a) is A, a distance from the center axis to the apex A is r1, and a point having the distance r1 from the center axis on a front edge (15a-F; 35a-F) in a rotation direction of the first blade element (15a; 35a) is B, a chord length of the first blade element (15a; 35a) along a direction connecting the apex A with the point B, is equal to or larger than a chord length of the second blade element (15b; 35b) along a direction connecting an apex C with a point D when an apex projecting from the positive pressure surface of the second blade element (15b; 35b) is C, a distance from the center axis to the apex C is r2, and a point having the distance r2 from the center axis on a front edge (15b-F; 35b-F) in a rotation direction of the second blade element (15b; 35b) is D. a hub including a side surface around a center axis; and a plurality of blades disposed on the side surface of the hub, wherein the blades each include a blade surface part, which is extended from a base end connected to the side surface of the hub to an outer edge, and the blade surface part includes an inner peripheral part, which is positioned on the base end side, and an outer peripheral part which is positioned on the outer edge side, an inner peripheral blade (15; 35), which extends from the side surface of the hub toward the outer edge side, is formed on a positive pressure surface of the blade surface part at the inner peripheral part of each of the blades, the inner peripheral blade (15; 35) includes a plurality of blade elements (15a, 15b; 35a, 35b) that project from the positive pressure surface of the blade surface part toward a positive pressure side, and are arranged side by side in a rotation direction of the blade, and the blade elements (15a, 15b; 35a, 35b) include a first blade element (15a; 35a), which is arranged on a front edge (12-F) side in the rotation direction of the blade, and a second blade element (15b; 35b), which is arranged to be adjacent to the first blade element (15a; 35a) on a rear edge (12-R) side in the rotation direction of the blade, a first opening (16; 36), which passes through the blade surface part from a negative pressure side toward the positive pressure side, is provided between the first blade element (15a; 35a) and the second blade element (15b; 35b) on the blade surface part, and the propeller fan being characterised in that when an apex projecting from the positive pressure surface of the first blade element (15a; 35a) is A, a distance from the center axis to the apex A is r1, and a point having the distance r1 from the center axis on a front edge (15a-F; 35a-F) in a rotation direction of the first blade element (15a; 35a) is B, a chord length of the first blade element (15a; 35a) along a direction connecting the apex A with the point B, is equal to or larger than a chord length of the second blade element (15b; 35b) along a direction connecting an apex C with a point D when an apex projecting from the positive pressure surface of the second blade element (15b; 35b) is C, a distance from the center axis to the apex C is r2, and a point having the distance r2 from the center axis on a front edge (15b-F; 35b-F) in a rotation direction of the second blade element (15b; 35b) is D.