Provided is an X-ray radiographic apparatus capable of accurately recognizing a position and orientation of a tip portion of an endoscope, wherein the X-ray radiographic apparatus includes a navigation processing part 70 for specifying a direction and position of an endoscope 50 and assisting an operation of the endoscope 50. This navigation processing part 70 includes: a position/direction detecting part 71 for detecting a position and direction of the tip portion of the endoscope 50 a CT image processing part 72 for processing a cone-beam CT image and a virtual endoscopic image processing part 73 for processing a virtual endoscopic image. A coronal image, a sagittal image, an axial image, a front side radioscopic image, a lateral directional radioscopic image and a virtual endoscopic image obtained by cone-beam X-ray CT radiography are displayed in division on a monitor screen of a first monitor 30, and a real endoscopic image is displayed on a monitor screen of a second monitor 40.
