To provide a radiation application apparatus which allows the operator to easily monitor the single cumulative dose distribution and the total cumulative dose distribution in a patient during application of a radiation application manipulation to the patient.SOLUTION: A radiation application apparatus 10 comprises: past cumulative dose distribution acquisition means 113 for acquiring the past cumulative dose distributions associated with a required patient identifying information from a cumulative dose distribution DB 17 in which a plurality of cumulative dose distributions can be registered； sequential cumulative dose distribution calculation means 116 for sequentially calculating a cumulative dose distribution as a first cumulative dose distribution during execution of a radiation application manipulation for the patient associated with the required patient identifying information, sequentially calculating a second cumulative dose distribution by adding the first cumulative dose distribution to the past cumulative dose distribution, and sequentially displaying the first cumulative dose distribution and the second cumulative dose distribution on a display unit 14 during execution of the radiation application manipulation； and cumulative dose distribution registration means 117 for registering a single cumulative dose distribution in the cumulative dose distribution DB 17.SELECTED DRAWING: Figure 5【課題】放射線照射装置において、操作者が、患者に対する放射線照射手技中に、当該患者に係る単一積算線量分布及び総計積算線量分布を容易に監視できるようにすること。【解決手段】放射線照射装置１０は、複数の積算線量分布を登録可能な積算線量分布ＤＢ１７から、所要の患者識別情報に対応する過去の積算線量分布を取得する過去積算線量分布取得手段１１３と、所要の患者識別情報に対応する患者に対する放射線照射手技の実行中に積算線量分布を第１積算線量分布として逐次算出するとともに、過去の積算線量分布に第１積算線量分布を積算することで第２積算線量分布を逐次算出し、放射線照射手技の実行中に第１積算線量分布及び第２積算線量分布を表示部１４に逐次表示させる逐次積算線量分布算出手段１１６と、単一積算線量分布を積算線量分布ＤＢ１７に登録する積算線量分布登録手段１１７と、を有する。【選択図】 図５
