Provided is a charged particle beam irradiation device comprising the following: an accelerator for accelerating charged particles and emitting a charged particle beam an irradiation unit for irradiating an irradiation target with the charged particle beam a transport line for transporting the charged particle beam emitted from the accelerator to the irradiation unit an energy adjustment unit that is provided to the transport line and adjusts the energy of the charged particle beam a plurality of electromagnets provided farther downstream on the transport line than the energy adjustment unit electromagnet power sources provided so as to correspond to each of the plurality of electromagnets and a control unit for controlling a parameter of the electromagnets in accordance with the energy of the charged particle beam. The electromagnet power sources have a storage unit for storing a parameter of the electromagnets for every layer irradiated with the charged particle beam in the irradiation target. The control unit transmits a signal relating to switching of layers to the electromagnet power sources.縮短層切換時間並縮短照射時間。本發明的帶電粒子束照射裝置(1)具備:加速器(11),用以射出帶電粒子束;照射噴嘴(12),用以向被照射體照射帶電粒子束;射束輸送線路(13),用以向照射噴嘴(12)輸送帶電粒子束;降能器(18),設置於射束輸送線路(13),並用以調整帶電粒子束的能量;複數個電磁鐵(25),比射束輸送線路(13)中的降能器(18)更靠下游側設置;電磁鐵電源(27),對應於各個複數個電磁鐵(25)而設置;以及,控制部(30),用以依據帶電粒子束的能量而控制電磁鐵(25)的參數,其中,電磁鐵電源(27)具有記憶部(27a),其用以記憶被照射體中的被照射帶電粒子束之每一層的電磁鐵(25)的參數,控制部(30)用以對電磁鐵電源(27)發送有關層切換之訊號。1‧‧‧帶電粒子束照射裝置11‧‧‧加速器12‧‧‧照射噴嘴13‧‧‧射束輸送線路14‧‧‧真空導管15‧‧‧ESS16‧‧‧BTS17‧‧‧GTS18‧‧‧降能器19‧‧‧收斂電磁鐵20‧‧‧偏轉電磁鐵21‧‧‧掃描電磁鐵22‧‧‧治療台23‧‧‧旋轉機架25‧‧‧電磁鐵27‧‧‧電磁鐵電源27a‧‧‧記憶部28‧‧‧真空導管30‧‧‧控制部P‧‧‧患者
