RADIAL TURBINE

A radial turbine 1 comprises a plurality of nozzle vanes 13 disposed along a circumferential direction inside a spiral scroll 3 and configured to regulate a flow of a working gas from the scroll 3 to a rotor blade 9, wherein each of the nozzle vane 13 includes a leading edge bulging portion 25 on both end portions in a width direction of an inlet leading edge portion 17, the leading edge bulging portion 25 being bulged toward a pressure face side of the nozzle vane relative to a central portion, so that a vane angle is configured to correspond with an inflow angle of the working gas to be flown into the nozzle vane 13, and wherein each of the nozzle vane 13 includes a trailing edge bulging portion 29 on both end portions in a width direction of a outlet trailing edge portion 27, the trailing edge bulging portion 29 being bulged toward the pressure face side relative to a central portion, so that an outflow angle of the working gas from the outlet trailing edge 27 of the nozzle vane becomes uniform.