The present invention provides a particle beam rotation irradiation apparatus including a movable floor installed within a frame which is retractable when an irradiation nozzle is moved, even in a corkscrew type particle beam rotation irradiation apparatus.The particle beam rotation irradiation apparatus 20 according to the present invention comprises: a frame 2 for supporting and rotating an irradiation nozzle 1, an irradiation nozzle support body 12 provided in the inner peripheral side of the frame 2 for supporting the irradiation nozzle 1, a movable floor 3 having movable floor rollers 6 movable in a circumferential direction with a rotating axis of the frame 2 as the center, and movable floor rails 7 provided in the circumferential direction of the inner peripheral side of the frame 2 for supporting the movable floor rollers 6, wherein the irradiation nozzle support body 12 and the movable floor 3 respectively have joint units 9 which are mutually detachable.本發明之粒子線旋轉照射裝置之目的為即使是螺旋型粒子線旋轉照射裝置,亦將照射噴嘴移動時可退避之移動地板設置於框架內。依據本發明之粒子線旋轉照射裝置20,係具備支撐照射噴嘴1並且旋轉的機架框架2、設於機架框架2之內周側,用以支撐照射噴嘴1的照射噴嘴支撐體12、具有可朝以機架框架2之旋轉軸為中心之圓周方向移動之移動地板滾輪6的移動地板3、及設於機架框架2之內周側之圓周方向,用以支撐移動地板滾輪6的移動地板軌道7,照射噴嘴支撐體12及移動地板3係分別具有可彼此裝卸的結合部9。1‧‧‧照射噴嘴2‧‧‧機架框架3‧‧‧移動地板4‧‧‧軸承環5‧‧‧軸承滾輪6‧‧‧移動地板滾輪7‧‧‧移動地板軌道9‧‧‧結合部10‧‧‧第1卡合部11‧‧‧第2卡合部12‧‧‧照射噴嘴支撐體19‧‧‧旋轉機架20‧‧‧粒子線旋轉照射裝置21‧‧‧射束傳送部22a、22b、22c、22d‧‧‧偏向電磁鐵23‧‧‧4極電磁鐵
