A propeller fan comprising: a hub having a side surface around a central axis (O); and a plurality of blades provided to the side surface , wherein the blade has, in a portion from a base connected to the hub to an outer periphery, an inner peripheral portion positioned on the base side and an outer peripheral portion positioned on the outer peripheral side, and has a plurality of blade elements (12-11, 12-12, 12-13) branching on a way from the outer peripheral portion to the inner peripheral portion, the plurality of blade elements (12-11, 12-12, 12-13) have a trailing edge (12-11-1) on a downstream side of rotation with the central axis (O) as a rotation center, and a leading edge (12-12-2) on an upstream side of the rotation, are connected to the side surface at a pitch angle with respect to the central axis (O), and form a hole (12-21) which is a flow path for airflow, between the adjacent blade elements (12-11, 12-12, 12-13), the plurality of blade elements (12-11, 12-12, 12-13) have a first blade element (12-11) on the upstream side of the rotation and a second blade element (12-12) on the downstream side of the rotation to be adjacent to the first blade element (12-11) which branch at a branch point on the way from the outer peripheral portion to the inner peripheral portion, and include an extension portion (12-11B) as a part of the first blade element (12-11), on the trailing edge (12-11-1) of the first blade element (12-11) from the branch point to the side surface , the extension portion (12-11B) is defined by a boundary (C1), the boundary (C1) having a positional relationship substantially parallel to the leading edge (12-12-2) of the second blade element (12-12) and the boundary (C1) having one end corresponding to the branch point , and at least a part of the leading edge (12-12-2) of the second blade element (12-12) overlaps with a rotation orbit of the extension portion (12-11B) with the central axis (O) as the rotation center. a hub having a side surface around a central axis (O); and a plurality of blades provided to the side surface , wherein the blade has, in a portion from a base connected to the hub to an outer periphery, an inner peripheral portion positioned on the base side and an outer peripheral portion positioned on the outer peripheral side, and has a plurality of blade elements (12-11, 12-12, 12-13) branching on a way from the outer peripheral portion to the inner peripheral portion, the plurality of blade elements (12-11, 12-12, 12-13) have a trailing edge (12-11-1) on a downstream side of rotation with the central axis (O) as a rotation center, and a leading edge (12-12-2) on an upstream side of the rotation, are connected to the side surface at a pitch angle with respect to the central axis (O), and form a hole (12-21) which is a flow path for airflow, between the adjacent blade elements (12-11, 12-12, 12-13), the plurality of blade elements (12-11, 12-12, 12-13) have a first blade element (12-11) on the upstream side of the rotation and a second blade element (12-12) on the downstream side of the rotation to be adjacent to the first blade element (12-11) which branch at a branch point on the way from the outer peripheral portion to the inner peripheral portion, and include an extension portion (12-11B) as a part of the first blade element (12-11), on the trailing edge (12-11-1) of the first blade element (12-11) from the branch point to the side surface , the extension portion (12-11B) is defined by a boundary (C1), the boundary (C1) having a positional relationship substantially parallel to the leading edge (12-12-2) of the second blade element (12-12) and the boundary (C1) having one end corresponding to the branch point , and at least a part of the leading edge (12-12-2) of the second blade element (12-12) overlaps with a rotation orbit of the extension portion (12-11B) with the central axis (O) as the rotation center. <EOS>