PROBLEM TO BE SOLVED: To easily and surely confirm a treatment result of PCI such as an indwelling state of a stent. An X-ray diagnostic apparatus of one embodiment uses an arm that supports an X-ray source and an X-ray detector, and the X-ray source and the X-ray detector to obtain at least two subjects. A specific unit that identifies the three-dimensional traveling direction of the blood vessel from a plurality of images taken from different directions, and a calculation unit that calculates the trajectory around the target site in the blood vessel based on the traveling direction of the blood vessel. An arm control unit that rotates the X-ray source and the X-ray detector with the arm so as to photograph the surroundings of the target portion along the calculated trajectory. [Selection diagram] Fig. 2【課題】ステントの留置状態等の、ＰＣＩの治療結果を、簡便に、かつ、確実に確認できるようにする。【解決手段】一実施形態のＸ線診断装置は、Ｘ線源とＸ線検出器とを支持するアームと、前記Ｘ線源と前記Ｘ線検出器とを用いて、被検体を少なくとも２つの異なる方向から撮影した複数の画像から血管の３次元的な走行方向を特定する特定部と、前記血管の中の対象部位の周りの軌道を、前記血管の走行方向に基づいて算出する算出部と、算出された前記軌道に沿って前記対象部位の周りを撮影するように、前記Ｘ線源と前記Ｘ線検出器とを前記アームで回転させるアーム制御部と、を備える。【選択図】 図２
