To provide a charged particle beam treatment apparatus capable of improving accuracy of a charged particle beam irradiation position in an irradiated body.SOLUTION: An irradiation part 2 of a charged particle beam treatment apparatus includes: an X direction scanning electromagnet 61a for scanning a charged particle beam B in an X-axis direction orthogonal to a base axis AX of the charged particle beam B； a Y direction scanning electromagnet 61b for scanning the charged particle beam B in a Y-axis direction orthogonal to the base axis AX and the X-axis direction； an X direction scanning electromagnet 62a for scanning the charged particle beam B in the X-axis direction； a Y direction scanning electromagnet 62b for scanning the charged particle beam B in the Y-axis direction； a first position monitor 63 for detecting a passing position of the charged particle beam B on a plane along the X-axis direction and the Y-axis direction； and a second position monitor 64 disposed on the downstream side of the X direction scanning electromagnet 62a, the Y direction scanning electromagnet 62b, and the first position monitor 63 for detecting a passing position of the charged particle beam B on a plane along the X-axis direction and the Y-axis direction.SELECTED DRAWING: Figure 4【課題】被照射体における荷電粒子線の照射位置の精度向上を図ることが可能な荷電粒子線治療装置を提供する。【解決手段】荷電粒子線治療装置１の照射部２は、荷電粒子線Ｂの基軸ＡＸに直交するＸ軸方向において荷電粒子線Ｂを走査するＸ方向走査電磁石６１ａと、基軸ＡＸ及びＸ軸方向に直交するＹ軸方向において荷電粒子線Ｂを走査するＹ方向走査電磁石６１ｂと、Ｘ軸方向において荷電粒子線Ｂを走査するＸ方向走査電磁石６２ａと、Ｙ軸方向において荷電粒子線Ｂを走査するＹ方向走査電磁石６２ｂと、Ｘ軸方向及びＹ軸方向に沿った平面における荷電粒子線Ｂの通過位置を検出する第１位置モニタ６３と、Ｘ方向走査電磁石６２ａ、Ｙ方向走査電磁石６２ｂ、及び第１位置モニタ６３より下流側に配置され、Ｘ軸方向及びＹ軸方向に沿った平面における荷電粒子線Ｂの通過位置を検出する第２位置モニタ６４と、を有する。【選択図】図４
