To provide X-ray imaging diagnostic equipment which can perform constantly optimum dark-current correction, and which can shorten a time required for the updating of dark-current correction data.

The X-ray imaging diagnostic equipment comprises an X-ray generating means (X-ray generator 20) for irradiating a subject 10 with an X-ray, an X-ray planar detector 30 which is arranged in the state of facing the X-ray generator 20, so as to detect the X-ray transmitted through the subject 10 and output the X-ray as image data, and a display means (monitor 80) for displaying image data which are output by the planar detector 30. The X-ray imaging diagnostic equipment is also equipped with a temperature measuring means (temperature sensor 40) for measuring the temperature of the planar detector 30, a temperature change determining means (temperature change determining part 55) for determining the necessity of the updating of the dark-current correction data, on the basis of the temperature of the planar detector 30, which is measured by the temperature measuring means (temperature sensor 40), and a dark-current correction data updating notification means (notification unit 60) for notifying an operator of the necessity of the updating.

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