To provide an X-ray diagnostic device capable of rotating an opening so that at least part of an irradiation region of an X-ray passing through the opening is maintained in the X-ray irradiation region before the rotation even when an ideal rotation center of an opening of an X-ray restriction member is in a position different from a position of a rotation axis of the X-ray restriction member.SOLUTION: An X-ray diagnostic device according to an embodiment includes: an X-ray restriction unit having an opening through which an X-ray passes； a rotation mechanism for causing the X-ray restriction unit to rotate around a predetermined rotation axis； a moving mechanism for causing the opening to be translated； and an interlocking control unit for executing interlocking control to control the rotation mechanism and the moving mechanism to cause the moving mechanism to translate the opening, interlocking with the rotation of the X-ray restriction unit by the rotation mechanism so that at least part of an irradiation region of the X-ray passing through the opening is maintained in an X-ray irradiation region before the interlocking control.SELECTED DRAWING: Figure 4【課題】Ｘ線制限部材の開口の理想回転中心がＸ線制限部材の回転軸と異なる位置にある場合であっても、開口を通過したＸ線の照射領域のうちの少なくとも一部が、回転前のＸ線の照射領域内に保たれるように、開口を回転させることができるＸ線診断装置を提供する。【解決手段】実施形態に係るＸ線診断装置は、Ｘ線を通過させる開口を有するＸ線制限部と、前記Ｘ線制限部を所定の回転軸周りに回転させる回転機構と、前記開口を平行移動させる移動機構と、前記開口を通過したＸ線の照射領域のうちの少なくとも一部が、連動制御前のＸ線の照射領域内に保たれるように、前記回転機構による前記Ｘ線制限部の回転に連動して前記移動機構に前記開口を平行移動させるよう前記回転機構および前記移動機構を制御する連動制御を行なう連動制御部と、を備える。【選択図】 図４
