There are provided with: an irradiation apparatus (10) that radiates a particle beam after forming the beam for each of layers a dose monitor (12) that measures a dose in real time a dose evaluation unit (70) that evaluates an irradiation dose for each of the layers on the basis of a measurement value (Ci) measured by the dose monitor (12) and a dose calibration factor set for each of the layers an irradiation control section (60) that performs radiation control for each of the layers on the basis of an evaluation result of the dose evaluation unit (70) and an interpolation value generation unit (74) that uses actual-measurement dose-calibration factors (αi) each obtained by radiating a particle beam to a simulated phantom (81) provided with a calibration dosimeter (82), to thereby generate an interpolation value or an estimation value (βi) of the dose calibration factor wherein, for each layer subject to the interpolation value or the calibration value (βi) and based on an irradiation condition of that layer, the interpolation value generation unit (74) performs weighting on each of the actual-measurement dose-calibration factors (αi).
