To reduce leakage of steam by providing steam passages supplying steam to a rotor blade on the side of the center of a rotor, regarding a recoverable steam cooled gas turbine.

Steam 70 for cooling of a low temperature and high pressure passes through supply side steam passages 12, 13, steam 70 is supplied to rotor blades 1, 2 from steam passages 15, 15, steam 70 after cooling is flowed out to each cavity 22 from steam passages 16, 17 and steam 70 is recovered as recovery steam 71 of a high temperature and low pressure from a rotor end 20 from recovery side steam passages 19, 21. Because portions where high pressure steam 70 leaks to the outside are reduced as compared with a system supplying steam from a conventional outside of the rotor because steam 70 for cooling of the low temperature and high pressure passes through the inside of the rotor of recovery steam 70 of the high temperature and low pressure and is supplied, leaking steam quantity is reduced.