A charged particle beam irradiation apparatus includes: an irradiation section configured to irradiate an irradiated body with a charged particle beam a multi-leaf collimator configured to set an irradiation range of the charged particle beam which is irradiated from the irradiation section an imaging section that is provided so as to be able to advance and retreat with respect to an irradiation axis of the charged particle beam which is irradiated from the irradiation section, between the irradiation section and the multi-leaf collimator, and directly images an opening portion of the multi-leaf collimator and a drive section configured to move the imaging section between an imaging position corresponding to an irradiation area which includes the irradiation axis of the charged particle beam and a retreated position away from the irradiation area.本發明提供一種帶電粒子束照射裝置(4),其能夠獲得多葉準直器(8)的開口部(8c)的清晰的拍攝圖像。本發明的帶電粒子束照射裝置(4)具有:散射體(6)及脊形過濾器(7),向患者(A)體內的腫瘤部(B)照射從迴旋加速器(5)供給之帶電粒子束(P);及多葉準直器(8),按腫瘤部(B)的形狀設定帶電粒子束(P)的照射範圍。脊形過濾器(7)與多葉準直器(8)之間配置有能夠相對於帶電粒子束(P)的照射軸(Q)進退之準直器形狀確認單元(9)。準直器形狀確認單元(9)具有直接拍攝多葉準直器(8)的開口部(8c)之攝影攝像機(11),且能夠在與包含帶電粒子束(P)的照射軸(Q)之照射區域(R)對應之拍攝位置和遠離包含帶電粒子束(P)的照射軸(Q)之照射區域(R)之退避位置之間移動。1‧‧‧帶電粒子束治療裝置5‧‧‧迴旋加速器4‧‧‧帶電粒子束照射裝置4a‧‧‧框體6‧‧‧散射體(照射部)7‧‧‧脊形過濾器(照射部)9‧‧‧準直器形狀確認單元R‧‧‧照射區域10‧‧‧安裝托架P‧‧‧帶電粒子束Q‧‧‧照射軸13‧‧‧屏蔽壁11‧‧‧攝影攝像機(拍攝部)8‧‧‧多葉準直器12‧‧‧投光器(光源部)8a‧‧‧葉片組8b‧‧‧葉片組8c‧‧‧開口部18a‧‧‧開口部18‧‧‧患者準直器(被照射體準直器)A‧‧‧患者(被照射體)B‧‧‧腫瘤部(照射目標物)
