An impeller includes a boss provided on a rotation axis and a blade provided on an outer circumferential side of the boss. The blade has a radially middle portion that is located midway between an outer circumferential edge and an inner circumferential edge in a radial direction of the blade from the rotation axis. A span-direction section of part of the blade that adjoins the leading edge is shaped such that part of a suction side of the blade that is located in an area between the radially middle portion and the outer circumferential edge is concave, and a span-direction section of part of the blade that adjoins the trailing edge is shaped such that part of the suction side of the blade that is located in the area between the radially middle portion and the outer circumferential edge is convex.