Disclosed is an X-ray imaging device which, in order to eliminate or suppress image quality deterioration resulting from focal point displacement even when X-ray focal point displacement is generated because of multiple thermal expansions of different temperature propagations, is provided with: an X-ray generating means (100) which irradiates X-rays from a focal point and which, when the X-ray generation means cools after multiple X-ray irradiations, has a first position which changes with a first change component, and a second position which changes with a second change component different from the first change component an X-ray detection means (104) a focal position detection means (300, 304) for detecting the focal position when X-rays have been irradiated a focal position change amount estimation means (105) which uses a first change amount changing with the first change component and a second change amount changing with the second change component to estimate the amount of change of the focal position at an arbitrary time point relative to a reference position of the focal point and a correction means (301) for correcting the relative position of the X-ray irradiation region and the X-ray detection means so as to cancel out the amount of change of the focal position estimated by the focal position change amount estimation means.La présente invention concerne un dispositif dimagerie par rayons X qui, en vue déliminer ou de supprimer une détérioration de la qualité dimage entraînée par un déplacement de point focal même lorsque le déplacement de point focal est généré en raison de multiples dilatations thermiques à propagations de température différentes, est équipé: dun moyen de génération de rayons X (100) qui irradie des rayons X depuis un point focal et qui, lors du refroidissement du moyen de génération de rayons X après une pluralité dirradiations de rayons X, présente une première position qui change avec une première composante de changement, et une seco
