An object of this invention is to provide a particle beam therapy system which can transport a beam to a plurality of treatment rooms as if simultaneously by time-sharing. In the particle beam therapy system (51), a beam transport system (59) includes a beam-path changer (16) for changing a beam path so as to transport a charged particle beam (81) to any one of the plurality of particle beam irradiation apparatuses (58) and a treatment management device (95) includes a beam-path controller (18) that generates an emitter control signal (csiga) for controlling an emitter (62) of an accelerator (54) and a beam-path changer control signal (kicker control signal (csigb)) for controlling the beam-path changer (16) so that, with respect to the plurality of particle beam irradiation apparatuses (58) in which treatment is performed at the same treatment period of time, the charged particle beam (81) is transported to each one of the plurality of particle beam irradiation apparatuses (58) for each time period allocated thereto.
