A treatment bed 8 arranged in a tip direction of an irradiation nozzle 104 and constructed movably, a treatment information system 2 that manages prescription data, a treatment control system 3 that receives a target position stored in the treatment information system 2 to cause a main display system 6 to display the target position, a pendant 7 to input a movement command for the treatment bed 8, the main display system 6 that receives the target position of the treatment bed 8 from the treatment control system 3 and displays an actual position of the treatment bed 8, and a patient positioning support system 9 that calculates correction values for the target position thereof to provide the correction values to the treatment control system 3 and the pendant 7 are included, wherein the treatment control system 3 sends the target position thereof to the treatment information system 2 at a period shorter than an operation sequence thereof and stores initial values to be sent in advance.
