PROBLEM TO BE SOLVED: To provide an X-ray movable diaphragm and an X-ray irradiating device, in which the mechanism is simplified and downsized, and the opening / closing range is less displaced even if the posture is changed. An aspect of the present invention is an X-ray movable diaphragm including a movement limiting mechanism that adjusts an X-ray irradiation range in a predetermined axial direction. In this X-ray movable diaphragm, the movement restricting mechanism includes a first movable restricting blade and a second movable restricting blade that move toward and away from each other in the axial direction, and a swing arm that is swingable about a central portion as a rotation center. A first link portion connected between one end side of the swing arm and the first movable limit blade, and a first link portion connected between the other end side of the swing arm and the second movable limit blade. And 2 link parts. By the swing of the swing arm, the first link portion and the second link portion are moved in opposite directions to approach and separate the first movable limit blade and the second movable limit blade in the axial direction. . [Selection diagram] Fig. 1【課題】機構の簡素化および小型化を図るとともに、姿勢変化があっても開閉範囲のずれが少ないＸ線可動絞りおよびＸ線照射装置を提供すること。【解決手段】本発明の一態様は、Ｘ線照射範囲を所定の軸方向に調整する可動制限機構を備えたＸ線可動絞りである。このＸ線可動絞りにおいて、可動制限機構は、前記軸方向に互いに接近および離反する第１可動制限羽根および第２可動制限羽根と、中央部を回転中心として揺動可能に設けられた揺動アームと、揺動アームの一端側と、第１可動制限羽根との間に接続された第１リンク部と、揺動アームの他端側と、第２可動制限羽根との間に接続された第２リンク部と、を備える。この揺動アームの揺動によって第１リンク部および前記第２リンク部を互いに逆方向に移動させることにより、第１可動制限羽根および第２可動制限羽根の前記軸方向への接近および離反を行う。【選択図】図１
