PROBLEM TO BE SOLVED: To provide improved operability in performing partial fluoroscopy. In an X-ray diagnostic apparatus, a first generation unit sequentially generates X-ray image data based on a detection result of an X-ray detector, and an X-ray diaphragm apparatus has a movable X-ray shielding member. , The range where the X-ray emitted from the X-ray tube is irradiated is limited, and the specifying unit is configured to move the X-ray blocking member that is moved by the X-ray diaphragm device based on the operation received by the input unit, Specifies the X-ray irradiation region in each X-ray image data generated by the generation unit, and the second generation unit uses the irradiation region to generate the X-ray shielding member by the first generation unit during movement. A first combined X-ray image data and the second X-ray image data stored in the storage unit and generated by the first generation unit before the X-ray shielding member is moved. 1 composite image data is sequentially generated while the X-ray shielding member is moving, and display control is performed. Sequentially displays the synthesized image indicated by the first of the synthesized image data to the display unit. [Selection diagram] Fig. 1【課題】部分透視を行う際の操作性の向上を提供する。【解決手段】Ｘ線診断装置において、第１の生成部は、Ｘ線検出器の検出結果に基づくＸ線画像データを順次生成し、Ｘ線絞り装置は、可動のＸ線遮蔽部材を有し、Ｘ線管から発せられるＸ線が照射される範囲を制限し、特定部は、入力部が受け付けた操作に基づいてＸ線絞り装置により移動されるＸ線遮蔽部材の移動中において、第１の生成部により生成される各Ｘ線画像データにおけるＸ線の照射領域を特定し、第２の生成部は、照射領域を用いて、Ｘ線遮蔽部材の移動中において第１の生成部により生成された第１のＸ線画像データと、記憶部に記憶され、かつ、Ｘ線遮蔽部材が移動される前に第１の生成部により生成された第２のＸ線画像データとを合成した第１の合成画像データを、Ｘ線遮蔽部材の移動中に順次生成し、表示制御部は、第１の合成画像データが示す合成画像を表示部に順次表示させる。【選択図】図１
