PROBLEM TO BE SOLVED: To provide a particle beam therapy device which is small-sized and light-weight and has a small number of components.SOLUTION: A particle beam therapy device 10 according to an embodiment comprises a particle beam guiding device 13 in which a therapy space 21 is formed, which is supported rotatably around a first rotary shaft 34 and which guides particle beams from a particle source 11 to an irradiation part 20 in the therapy space 21. The particle beam guiding device 13 includes: an upstream side guiding part 32 which receives the particle beams from the particle source 11 via an upstream side rotational seal part 45 disposed at a position of a first rotary shaft 34 and guides the particle beams to a downstream side rotary seal part 46 disposed at a position apart from the first rotary shaft 34 in a radial direction and a downstream side guiding part 33 which is rotatably supported around a second rotary shaft 49 passing through the downstream side rotary seal part 46 and guides the particle beams emitted from the upstream side guiding part 32 to a radiation part 20 via the downstream side rotary seal part 46.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】小型軽量で部品点数が少ない粒子線治療装置を提供する。【解決手段】実施形態の粒子線治療装置10は、内部に治療スペース21を形成して第1の回転軸34の周りを回転可能に支持されて粒子源11からの粒子線を治療スペース21内の照射部20に導く粒子線ガイド装置13を備える。粒子線ガイド装置13は、粒子源11からの粒子線を、第1の回転軸34の位置に配置された上流側回転シール部45を介して受け入れて第1の回転軸34から半径方向に離れた位置に配置された下流側回転シール部46に導く上流側ガイド部32と、下流側回転シール部46を通る第2の回転軸49の周りに回転可能に支持されて、上流側ガイド部32から出た粒子線を、下流側回転シール部46を介して照射部20に導く下流側ガイド部33と、を有する。【選択図】図1
