PURPOSE:To prevent the application of heat to the end face of a nozzle and improve reliability and service life by installing a cooling air current path which runs from an upper stream of a rotating blade to the end face of a fuel nozzle in parallel to the rotating blade inside the fuel nozzle. CONSTITUTION:A cooling air current path 16, which runs from the upper stream of a rotating blade 9 to a cooling groove 15 on a nozzle end face, is formed on a rotary equipment cone 7, avoiding an exhaust nozzle 14. This construction makes it possible to use a differential pressure between the upper stream and the downstream of the rotating blade 9 as a drive force so as to let a cooling air flow and discharge the cooling air from a nozzle end face groove 15. It is, therefore, possible to protect the nozzle end face from the heat of flames and hence improve the reliability and device life as well.