The objective is to obtain aparticle radiation therapy device capable of irradiating particle radiation by using the same irradiating nozzle with fixed length without expanding the beam size, while being able to irradiate with high precision, wherein theparticle radiation therapy device comprises treatment table control portion (61) for controlling the position of treatment table (30), and irradiation control portion (60) for outputting an order to control thetreatment table control portion, accelerator (1) and scanning electromagnet (7), and after thetreatment table control portion controlled the treatment table by having a patient isocenter (a patient reference position of a patient) removed to a position of irradiation isocenter (IC2) being set at a position closer to irradiating nozzle (4) than that of apparatus isocenter (IC1) (a reference of the positional relation between the irradiating nozzle and the treatment table), the irradiation control portion outputted an order to irradiate particle radiation towards the patient.本發明之目的在於獲致一種粒子線治療裝置,可在長度固定之照射噴嘴之狀態下抑制射束尺寸的擴大而照射粒子線,且可進行精確度高的照射。本發明之粒子線治療裝置係具備:治療台控制部(61),用以控制該治療台(30)的位置;及照射控制部(60),用以輸出用來控制該治療台控制部與加速器(1)與掃描電磁鐵(7)之指令;其中,治療台控制部在以使患者之患部基準位置之患者等角點移動至設定在較照射噴嘴(4)與治療台之位置關係之基準的機器等角點(IC1)更接近照射噴嘴之位置之照射等角點(IC2)之位置為止之方式控制治療台後,照射控制部係輸出對患者照射粒子線的指令。1‧‧‧加速器2、2a‧‧‧粒子線3‧‧‧真空導管4‧‧‧照射噴嘴5‧‧‧X方向掃描電磁鐵6‧‧‧Y方向掃描電磁鐵7‧‧‧掃描電磁鐵8‧‧‧射束取出窗9‧‧‧射束位置監視器11、11a‧‧‧患者13‧‧‧下游真空導管30‧‧‧治療台60‧‧‧照射控制部61‧‧‧治療台控制部62‧‧‧治療計劃部70‧‧‧掃描電磁鐵電源90‧‧‧劑量監視器IC1‧‧‧機器等角點IC2‧‧‧照射等角點SAD1、SAD2‧‧‧照射距離
