To provide a rotary propulsion blade element capable of reducing the weight of a rotary propulsion blade.

The rotary propulsion blade element 1 has a twisted surface subjected to the relative rotational force from the fluid flowing in the axial direction of a rotary shaft 2 in the rotational direction, and a hole 3 to allow the fluid to pass through. The twisted surface is formed in a completely closed or substantially closed annular surface, and the hole 3 is surrounded by an annular surface.