To provide a blade for a rotary machine capable of inhibiting secondary flow and preventing increase of a trailing edge loss.

This blade is provided with a blade shape part 2 which is a blade annularly arranged around a rotary shaft line and extends in a radial direction, an end wall 3 positioned at least one side of an inside end part and an outside end part in a radial direction of a blade shape part 2, and a corner part 4 smoothly connecting the blade shape part 2 and the end wall 3. The value of curvature radius on the surface of the corner part 4 reduces toward a trailing edge 6 from a leading edge 5 of the blade shape part 2.