Disclosed in the present invention is turbine. The turbine of the present invention comprises a rotor; a blade installed on the rotor, and including a cooling flow path in which a cooling fluid flows inside; and a stator installed to surround the outer side of the blade, wherein the blade comprises one or more rib turbulator protruding to the inside of the cooling path; and at least one auxiliary protrusion protruding from the outer surface of the rib turbulator.
