The objective is to realize an absorption through a charged particle beam transporting system of difference in emittance occurred when irradiation is conducted by a belated bringing-out from a synchrotron, and a beam size with a small rotation dependency by an isocenter. Charged particle beam transporting system (59) according to the present invention is characterized by that its static transporting portion (61) is constituted by having a phase of phase-space distribution of charged particle beam (31) upon an entrance of rotary deviation portion (60) rotating about gantry rotary axis (15) of a rotary gantry become a phase determined in accordance with a calculation based upon an average value of a first phase advance and a second phase advance. The first phase advance is a varied amount of the phase within the phase-space distribution advanced from the entrance of rotary deviation portion (60) until isocenter (IC) in a case where a gantry angle is the gantry standard angle, and the second phase advance is an aforementioned varied amount in a case where the gantry angle is an angle rotated 90° from the gantry standard angle.本發明之帶電粒子射束輸送系統及粒子束治療裝置,其目的在於以帶電粒子射束輸送系統來吸收從加速器以較慢之取出方式射出時所產生的發射率(emittance)之差異,且以照射基準點(isocenter)來實現旋轉依存性少之射束尺寸。本發明之帶電粒子射束輸送系統(59)的固定輸送部(61),其特徵在於:使位在繞著旋轉支架之支架旋轉軸(15)之周圍旋轉的旋轉偏向部(60)之入口的帶電粒子射束(31)之相位空間分佈的相位,成為以基於第1相位超前(phase advance)及第2相位超前之平均值的運算為基礎而被決定的相位。第1相位超前,係在支架角度為支架基準角度時,相位空間分佈中的相位從旋轉偏向部(60)之入口前進至照射基準點(IC)的變化量,而第2相位超前,係在支架角度為從支架基準角度旋轉90°後之角度時的上述變化量。10a、10b、10c‧‧‧偏向電磁鐵11a、11b、11c、11d‧‧‧四極電磁鐵46‧‧‧入射裝置47‧‧‧射出裝置48a、48b、48c、48d、48e、48f、48g、48h、48i‧‧‧偏向電磁鐵49a、49b、49c、49d、49e、49f、49g、49h、49i、49j‧‧‧四極電磁鐵51‧‧‧粒子束治療裝置52‧‧‧射束產生裝置53‧‧‧前級加速器54‧‧‧加速器57‧‧‧真空導管58a、58b‧‧‧粒子束照射裝置59‧‧‧帶電粒子射束輸送系統60‧‧‧旋轉偏向部61‧‧‧固定輸送部73、74‧‧‧射束座標
