PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of reducing radiation dose for an analyte and an operator by displaying an image showing a puncture needle on the analyte and a peripheral tissue around the needle.SOLUTION: The X-ray CT apparatus includes a projection unit, a data processing unit, a display control unit, a first area setting unit, a second area setting unit and a system control unit. The projection unit irradiates an analyte with X-rays and detects X-rays passing through the analyte. The data processing unit receives an output of the projection unit and generates image data showing a three-dimensional area. The display control unit causes a display unit to display an image based on the image data. The first area setting unit sets a first area which is an area including a preset puncture route. The second area setting unit sets a second area which is an area including the tip of a puncture needle on the basis of the image data during puncturing. The system control unit controls the projection unit to decrease the intensity of X-rays radiated to at least an area in the first area excluding the second area.
