To improve the accessibility to an examinee at a radiation generation part and a detection part and to accurately and easily enable various positionings.

This X-ray diagnostic device 100 is especially constituted of first and second arms (holding means) 4 and 5, an arm holder (supporting base) 6 for supporting the first and second arms 4 and 5, an X-ray generation part 1 held by the first and second arms 4 and 5, an X-ray detection part 2 arranged facing the X-ray generation part 1 with the examinee 7 between, and a C-shaped arm 3 for holding the X-ray detection part 2.