An X-ray CT apparatus according to an embodiment includes a gantry, an air inlet, and an air outlet. The gantry supports an X-ray tube and an X-ray detector. The air inlet is provided in the gantry to draw air into the gantry from outside the gantry. The air outlet is provided in a lower section of the gantry to discharge air from the gantry through a path that houses a controller that controls the gantry.
