An X-ray imaging apparatus 1 includes an imaging device 31. Imaging device 31 has a lens 33, an imaging device 37, a circuit for driving the imaging device, and a board 53, 57 having a circuit used for processing video signals that are produced from the imaging device. These structural elements of the imaging device 31 are integrally rotatable as one body. Even when an X-ray image intensifier and an X-ray generator are revolved around the object, an output image formed on the output surface can be displayed as an upright image, if required. In addition, only the structural component by which the lens and the board 53 are connected together requires a certain level of precision, so that the cost for preparing the structural components of the apparatus is low as a whole.