The present invention provides a kind of charged particle beam therapeutic device of the stabilisation of intensity that can be realized charged particle beam. Charged particle beam therapeutic device (1) of the invention has: ion source (10),Generate charged particle； Accelerator (3),The charged particle of the generation in ion source (10) is accelerated and projects charged particle beam (B)； Irradiation portion (2),Charged particle beam (B) is irradiated to the tumour of patient (15)； And control unit (7),It controls ion source (10),The action parameter of the ion source (10) when irradiating charged particle beam (B) to the tumour of patient (15) has been interrupted in control unit (7) memory,When restarting to irradiate charged particle beam (B) to the tumour of patient (15),Control unit (7) makes ion source (10) to work according to the action parameter remembered.本發明提供一種能夠實現帶電粒子束的強度的穩定化之帶電粒子束治療裝置。本發明的帶電粒子束治療裝置(1)具備：離子源(10)，生成帶電粒子；加速器(3)，對在離子源(10)中生成之帶電粒子進行加速並射出帶電粒子束(B)；照射部(2)，向患者(15)的腫瘤照射帶電粒子束(B)；及控制部(7)，控制離子源(10)，控制部(7)記憶中斷了向患者(15)的腫瘤照射帶電粒子束(B)時的離子源(10)的動作參數，在重新開始向患者(15)的腫瘤照射帶電粒子束(B)時，控制部(7)依據已記憶之動作參數使離子源(10)工作。
