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 based 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 is extending 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 projects from the positive pressure surface of the blade surface part toward a positive pressure side, and includes a plurality of blade elements, which are arranged side by side in a rotation direction of the blade, the blade elements include a first blade element (15a, 35a), which is arranged on a front edge 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 on a rear edge (12-R) side in the rotation direction of the blade, and 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 and the second blade element on the blade surface part, the propeller fan being characterised in that a space between an outer edge of the first blade element, which is extended from the side surface toward the outer edge side of the blade, and an outer edge of the second blade element, which is extended from the side surface toward the outer edge side of the blade on the positive pressure surface side, is opened from the side surface in a radial direction of the blade surface part, so that an air current, which comes from the negative pressure side toward the positive pressure side through the first opening, flows from the first opening toward the outer edge side of the blade along the positive pressure surface. 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 based 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 is extending 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 projects from the positive pressure surface of the blade surface part toward a positive pressure side, and includes a plurality of blade elements, which are arranged side by side in a rotation direction of the blade, the blade elements include a first blade element (15a, 35a), which is arranged on a front edge 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 on a rear edge (12-R) side in the rotation direction of the blade, and 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 and the second blade element on the blade surface part, the propeller fan being characterised in that a space between an outer edge of the first blade element, which is extended from the side surface toward the outer edge side of the blade, and an outer edge of the second blade element, which is extended from the side surface toward the outer edge side of the blade on the positive pressure surface side, is opened from the side surface in a radial direction of the blade surface part, so that an air current, which comes from the negative pressure side toward the positive pressure side through the first opening, flows from the first opening toward the outer edge side of the blade along the positive pressure surface.