Patent ID: 8439627

Claim:
A steam turbine comprising: a casing; a rotor arranged inside the casing so as to extend in an axial direction of the casing; a rotor disk integrally formed with the rotor; a rotor-side implanting portion formed in the rotor disk and provided with hook portions and recessed portions alternately in arrangement; a moving blade; and a moving blade-side implanting portion formed in the moving blade in which a plurality of moving blades are arranged on the rotor disk in a circumferential direction of the rotor and provided with hook portions and recessed portions alternately in arrangement, wherein the moving blade-side implanting portions of the moving blades and the rotor-side implanting portions are engaged with each other in a manner such that the hook portions of the rotor-side implanting portions are engaged with the moving blade-side recessed portions, respectively, each with a gap as a first gap and the hook portions of the moving blade-side implanting portions are engaged with the rotor-side recessed portions, respectively, each with a gap as a second gap, in a manner such that the second gap is smaller than the first gap, and a cooling medium flows through the first and second gaps.