Charged particle beam irradiation apparatus

A charged particle beam irradiation apparatus comprising:

• an irradiation section configured to irradiate a body with a charged particle beam;
• a gantry in which the irradiation section is disposed and which can rotate or oscillate around a central axis line;
• an enclosure which has a tubular side wall extending along the central axis line, vertical walls provided at both ends in a direction along the central axis line of the side wall, and an opening portion provided at a portion of the side wall and in which an irradiated body is disposed inside thereof;
• and
• a gantry-side transport line that has an inlet section on which the charged particle beam emitted from an accelerator is incident and that is supported by the gantry and configured to transport the charged particle beam incident from the inlet section, to the irradiation section,
• wherein the gantry has
• a first bearing section which is provided between the inlet section of the gantry-side transport line and the enclosure and supports the gantry so as to be able to rotate or oscillate, and
• a second bearing section which is provided on a side opposite to the first bearing section with respect to the enclosure and supports the gantry so as to be able to rotate or oscillate.