The objective of the present invention is to obtain a particle beam therapy system in which particle beam irradiation is implemented in a plurality of treatment rooms so that a great number of patients can undergo the therapy.There are provided with a respiration induction apparatus (22) that induces respiration, based on a desired respiration waveform (WIb) a switching device (32) that switches the orbit of a particle beam and an irradiation apparatus (21) that controls irradiation, in synchronization with the desired respiration waveform (WIb). A controller (4), which performs synchronization control of the switching device (32) and the respiration induction apparatuses (22) in a plurality of treatment rooms (6), adjusts the periods and the phases of the desired respiration waveforms (WIb) of the respiration induction apparatuses in the treatment rooms (6) so that the irradiation times (TI) synchronized with the desired respiration waveforms (WIb) in the treatment rooms (6) do not overlap with one another, and controls the switching device (32) so as to switch the orbits of the particle beam, in accordance with the respective irradiation times of the treatment rooms (6).
