A particle beam therapy system, comprising: - a plurality of treatment rooms; - a particle beam transport path that is adapted to connect an accelerator with each of the plurality of treatment rooms; - a switching device, provided in the transport path, that is adapted to switch the orbits of a particle beam emitted from the accelerator, in such a way that the particle beam is supplied to one of the plurality of treatment rooms; - a respiration induction apparatus, provided in each of the plurality of treatment rooms, that is adapted to induce the respiration of a patient, based on a desired respiration waveform (WIb); - an irradiation apparatus, provided in each of the plurality of treatment rooms, that is adapted to form a supplied particle beam into an irradiation field corresponding to an irradiation subject and control irradiation onto the irradiation subject, in synchronization with at least the desired respiration waveform (WIb); and - a controller that is adapted to perform synchronization control of the switching device and the respiration induction apparatuses in a predetermined number of, at least two, treatment rooms among the plurality of treatment rooms, wherein the controller is adapted to adjust the cycles and the phases of the desired respiration waveforms (WIb) in the predetermined number of treatment rooms so that irradiation times synchronized with the desired respiration waveforms (WIb) in the predetermined number of treatment rooms do not overlap with one another, and control the switching timing of the switching device so as to switch the orbits of the particle beam, in accordance with the respective irradiation times of the predetermined number of treatment rooms. - a plurality of treatment rooms; - a particle beam transport path that is adapted to connect an accelerator with each of the plurality of treatment rooms; - a switching device, provided in the transport path, that is adapted to switch the orbits of a particle beam emitted from the accelerator, in such a way that the particle beam is supplied to one of the plurality of treatment rooms; - a respiration induction apparatus, provided in each of the plurality of treatment rooms, that is adapted to induce the respiration of a patient, based on a desired respiration waveform (WIb); - an irradiation apparatus, provided in each of the plurality of treatment rooms, that is adapted to form a supplied particle beam into an irradiation field corresponding to an irradiation subject and control irradiation onto the irradiation subject, in synchronization with at least the desired respiration waveform (WIb); and - a controller that is adapted to perform synchronization control of the switching device and the respiration induction apparatuses in a predetermined number of, at least two, treatment rooms among the plurality of treatment rooms, wherein the controller is adapted to adjust the cycles and the phases of the desired respiration waveforms (WIb) in the predetermined number of treatment rooms so that irradiation times synchronized with the desired respiration waveforms (WIb) in the predetermined number of treatment rooms do not overlap with one another, and control the switching timing of the switching device so as to switch the orbits of the particle beam, in accordance with the respective irradiation times of the predetermined number of treatment rooms.