Steam turbine rotor and steam turbine

A method of fixing a seal fin to a fixing groove constituted by an annular groove formed over a circumferential direction in an outer peripheral surface of a turbine rotor:

• wherein the seal fin is constituted by disposing a plurality of seal fin divided structures in the circumferential direction, each of the plurality of seal fin divided structures has a base portion disposed on a bottom surface of the fixing groove and extending in a groove width direction of the fixing groove, and a fin portion standing from one end side in the groove width direction of the base portion to an opening side of the fixing groove, and the plurality of seal fin divided structures include a shortest seal fin divided structure configured so that a length in the circumferential direction is the shortest seal fin divided structure of the plurality of seal fin divided structures;
• and
• the method of fixing the seal fin, comprising:
• sequentially placing each of the plurality of seal fin divided structures other than the shortest seal fin divided structure in the fixing groove and fixing them with fixing members;
• and
• finally placing the shortest seal fin divided structure in the fixing groove and fixing it with a fixing member.