PROBLEM TO BE SOLVED: To provide a charged particle beam therapy apparatus that can be miniaturized.SOLUTION: When a deflection angle of a first deflection electromagnet 21 is a first deflection angle θ1, and the deflection angle of a second deflection electromagnet 22A is a second deflection angle θ2, the second deflection angle θ2 of the second deflection electromagnet 22A becomes an angle going to the side opposite to the first deflection angle θ1 with the size of twice as large as the first deflection angle θ1. As a result, the second deflection electromagnet 22A can irradiate a patient W with the charged particle beam B at an irradiation angle θ3 of the same size as the first deflection angle θ1. As having such a simple relationship, the patient W can be irradiated with the charged particle beam B at a desired irradiation angle θ3, only by adjusting the magnetic field strength of the first deflection electromagnet 21 and the second deflection electromagnet 22A. A charged particle beam therapy apparatus 1 can be reduced in the size of the height direction as compared to a device of a rotating gantry system, and can be reduced in the footprint as compared to a case of using many deflection electromagnets.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】小型化を図ることができる荷電粒子線治療装置を提供する。【解決手段】第１偏向電磁石２１の偏向角を第１偏向角θ１とし、第２偏向電磁石２２Ａの偏向角を第２偏向角θ２とした場合、第２偏向電磁石２２Ａの第２偏向角θ２は、第１偏向角θ１の二倍の大きさで当該第１偏向角θ１と反対側へ向かう角度となる。これにより、第２偏向電磁石２２Ａは、第１偏向角θ１と同じ大きさの照射角θ３にて、患者Ｗに荷電粒子線Ｂを照射することができる。このようなシンプルな関係性を有するため、第１偏向電磁石２１及び第２偏向電磁石２２Ａの磁場強度を調整するだけで、所望の照射角θ３で患者Ｗに荷電粒子線Ｂを照射することができる。荷電粒子線治療装置１は、回転ガントリ方式の装置に比して高さ方向のサイズを低減することができ、且つ、多数の偏向電磁石を用いる場合に比してフットプリントを低減することができる。【選択図】図５
