A treatment bed arranged in a tip direction of an irradiation nozzle and constructed movably, a treatment information system that manages prescription data, a treatment control system that receives a target position stored in the treatment information system to cause a main display system to display the target position, a pendant to input a movement command for the treatment bed, the main display system that receives the target position of the treatment bed from the treatment control system and displays an actual position of the treatment bed, and a patient positioning support system that calculates correction values for the target position thereof to provide the correction values to the treatment control system and the pendant are included, wherein the treatment control system sends the target position thereof to the treatment information system at a period shorter than an operation sequence thereof and stores initial values to be sent in advance.
