In the present invention, an irradiation control section 80 includes an interlock circuit 14a imposing an interlocking value to a beam intensity. Further, the number of scans is determined with an irradiation control calculating section 70 based on measurement results of an imparted amount of rays and a ray amount correction, a total light spot count value of a predetermined amount of rays introduced by the number of irradiation light spots, and the interlocking value. The irradiation control section 80, based on the beam intensity imposed with the interlocking value, performs scans with the predetermined light spot count value measured by a ray amount monitor 42, and performs irradiation with the determined number of scans.本發明係於照射控制部80具備將聯鎖值附加於光束強度之聯鎖電路14a,藉由照射控制計算部70,根據投射線量、線量校正的測定結果、及由照射光點數所導出之預定之線量的合計光點計數值以及聯鎖值而決定掃描次數,且使照射控制部80藉由被附加聯鎖值之光束強度,以線量監視器42所測定之預定的光點計數值進行掃描,並以決定之掃描次數進行照射。10‧‧‧粒子射線產生部11‧‧‧射入器12‧‧‧加速器13‧‧‧加速器控制器14‧‧‧照射線量控制器14a‧‧‧聯鎖電路16‧‧‧光束掃描控制器20‧‧‧粒子射線輸送部30‧‧‧粒子射線照射部32‧‧‧治療台40‧‧‧照射噴嘴41、41a、41b‧‧‧掃描用偏向電磁鐵42‧‧‧線量監視器43‧‧‧脊形濾波器45‧‧‧掃描用偏向電磁鐵驅動電源60‧‧‧治療計畫部70‧‧‧照射控制計算部80‧‧‧照射控制部100‧‧‧患者PB‧‧‧粒子射線
