A blade comprising: a leading edge portion, which is where fluid flows in; a pressure surface which is a concave curve shape concaved along a direction fluid flows; a suction surface which is a convex curve shape convexed along a direction the fluid flows; and a trailing edge portion, which is where the fluid flows out, wherein a disturbance addition portion is provided on the suction surface closer to the leading edge portion than a maximum velocity point, where the flow velocity of the fluid is maximized on the suction surface, for disturbing a laminar flow on the suction surface and for transitioning to a turbulent flow, wherein the disturbance addition portion is concaved in a thickness direction of the blade formed by the pressure surface and the suction surface, and formed in a step portion extending along the direction fluid flows, on the suction surface, a first suction surface located in the leading edge portion and a second suction surface located in the trailing edge portion are connected via the step portion, the second suction surface is located closer to the pressure surface than an imaginary curve, which is made when the first suction surface is extended to the trailing edge portion side along the second suction surface, the disturbance addition portion includes a connection portion which connects the disturbance addition portion with the first suction surface, the connection portion is a convex curve shape convexed toward the flow direction of the fluid, and the disturbance addition portion is provided so as to extend over the whole area in the blade height direction on the suction surface. a leading edge portion, which is where fluid flows in; a pressure surface which is a concave curve shape concaved along a direction fluid flows; a suction surface which is a convex curve shape convexed along a direction the fluid flows; and a trailing edge portion, which is where the fluid flows out, wherein a disturbance addition portion is provided on the suction surface closer to the leading edge portion than a maximum velocity point, where the flow velocity of the fluid is maximized on the suction surface, for disturbing a laminar flow on the suction surface and for transitioning to a turbulent flow, wherein the disturbance addition portion is concaved in a thickness direction of the blade formed by the pressure surface and the suction surface, and formed in a step portion extending along the direction fluid flows, on the suction surface, a first suction surface located in the leading edge portion and a second suction surface located in the trailing edge portion are connected via the step portion, the second suction surface is located closer to the pressure surface than an imaginary curve, which is made when the first suction surface is extended to the trailing edge portion side along the second suction surface, the disturbance addition portion includes a connection portion which connects the disturbance addition portion with the first suction surface, the connection portion is a convex curve shape convexed toward the flow direction of the fluid, and the disturbance addition portion is provided so as to extend over the whole area in the blade height direction on the suction surface.