This particle beam therapy apparatus (50) is provided with a dose distribution computation apparatus (10) which includes: a beam information storage unit (a measured energy storage unit (14), a measured charge storage unit (12), and a measured beam central axis storage unit (13)) that stores measured particle beam information which is particle beam information of a particle beam (20) measured by measurement apparatuses (6, 7, 8) a total dose computation unit (15) that computes radiation dose distribution (total dose distribution (Di)) on the basis of the measured particle beam information (measured energy (E), measured beam dose (measured charge number (Q)), and measured beam central axis position (Px, Py)) and a planned dose comparison unit (16) that computes a dose distribution difference (ΔDi) which is the difference between the radiation dose distribution (total dose distribution (Di)) and a target dose distribution (Dobji). From the second therapeutic radiation, the particle beam therapy apparatus (50) is controlled on the basis of control data that includes a corrected beam dose (corrected total charge number (Qcj)) that corrects the dose distribution difference (ΔDi).
