The purpose of this study is to obtain a particle therapy apparatus capable of suppressing the effect of leakage dose. An irradiation nozzle (21) to sequentially irradiate a particle (b) of a predetermined dose to each of the irradiation nozzle (21) for irradiating a particle beam (b) emitted from the accelerator (1) in a predetermined direction and a plurality of spots (SP) set in a surface direction (ASS) within an object of irradiation (TC) An irradiation control part (42) for controlling the operation of the operation of the accelerator (1) and a control part (4) for controlling the emission of the particle (b) from the accelerator (1) are provided, and the irradiation control part (42) intercepts a predetermined period (PW) or a particle (b) from the point (TF) when the emission is switched from on to off During the completion of the irradiation, the radiation nozzle (21) scans the particle beam (b) in the predetermined range (AP) within the irradiation target (TC).漏れ線量の影響を抑制できる粒子線治療装置を得ることを目的とする。加速器(1)から出射された粒子線(B)を所定方向に向けて照射する照射ノズル(21)と、照射対象(TC)内の面方向(ASS)内に設定された複数のスポット(SP)のそれぞれに対し、所定線量の粒子線(B)を順次照射するように、照射ノズル(21)の動作を制御する照射制御部(42)と、加速器(1)からの粒子線(B)の出射をON/OFF制御する制御部(4)と、を備え、照射制御部(42)は、出射がONからOFFに切り替えられた時点(TF)からの所定期間(PW)もしくは粒子線(B)が遮断されるまでの間、照射ノズル(21)で粒子線(B)を照射対象(TC)内の所定範囲(AP)内に向けて希釈走査させる。
