Rotating irradiation therapy apparatus

A rotating irradiation therapy apparatus having a charged particle beam irradiation device, a beam transport device for introducing a charged particle beam to the irradiation device, a rotating body on which the beam transport device and the irradiation device are mounted, and rotating body support devices with freely-rotating rollers that come into contact with a circular member contained in the rotating body to support the rotating body, the rotating irradiation therapy apparatus comprising:

• a first circular member which comes into contact with the rollers of the rotating body support devices at one axial end of the rotating body;
• a second circular member which comes into contact with the rollers of the rotating body support devices at the other axial end of the rotating body;
• and
• an intermediate circular member which comes into contact with the rollers of at least one of the rotating body support devices at a different axial position of the rotating body between the first circular member and the second circular member.