A rotary irradiation apparatus of an embodiment comprises: a rotating gantry (3)； superconducting electromagnets (5) which are disposed on the rotating gantry (3), form deflecting magnetic fields which deflect the trajectory of a charged particle beam and/or convergent magnetic fields which focus the charged particle beam, and guide the charged particle beam to an irradiation subject； a rotating gantry drive unit (24) which rotationally drives the rotating gantry (3)； and a control device (20) which controls the rotating gantry drive unit (24) to cause the rotating gantry (3) to rotate and stop while the superconducting electromagnets (5) are in a state of excitation.
