According to an embodiment, an X-ray CT system includes a gantry, a first couch, a second couch, a carrier unit, and control circuitry. The gantry includes an X-ray tube, an X-ray detector, and an operation unit. The first couch is arranged in a first room. The second couch is arranged in a second room. When carrying the gantry to the first room, the carrier unit arranges the gantry in an orientation in which the front side of the gantry faces the first couch. When carrying the gantry to the second room, the carrier unit arranges the gantry in an orientation in which the back side of the gantry faces the second couch. The control circuitry controls the direction of the tilt movement of the gantry in accordance with the room where the gantry is arranged.
