PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of reducing a time for creating correction data for correcting projection data.SOLUTION: An X-ray CT apparatus includes control means for controlling X-ray generation means and X-ray detection means. The X-ray CT apparatus creates correction data for correcting projection data of a subject in accordance with a scan condition in a first mode, and corrects the projection data using the correction data in a second mode. The X-ray CT apparatus includes scan condition storage means and display control means. Scan conditions at the time when the subject is scanned within a predetermined period of time in the second mode are sequentially stored in the scan condition storage means. The display control means causes display means to display a scan condition that can be specified in the first mode, and causes the display means to display the scan conditions stored in the scan condition storage means as a candidate scan condition for updating the correction data.
