Turbine rotor with bolt fastening arrangement and passages

A turbine rotor configured by joining a first rotor component member and a second rotor component member together by bolt fastening with a first end surface of the first rotor component member and a second end surface of the second rotor component member abutting on each other, the turbine rotor comprising:

• a cylindrical recessed portion that is formed at the first end surface and is recessed in a center axis direction of the turbine rotor;
• an axial passage that is bored in the center axis direction of the turbine rotor and that is connected with the cylindrical recessed portion and through which a cooling medium flows;
• an introduction passage that introduces the cooling medium into the axial passage;
• a discharge passage that penetrates from the axial passage into an outer peripheral surface of the turbine rotor and discharges the cooling medium;
• and
• a sealing member that is arranged in the cylindrical recessed portion and seals one end of the axial passage.