According to one embodiment, an X-ray computed tomography apparatus includes a gantry main body, a base, a first support frame, a second support frame and gantry control circuitry. The gantry control circuitry controls a tilt of the gantry main body, a movement of the table top by the first support frame, and a movement of the first support frame by the second support frame. The gantry control circuitry executes switching between a first tilt mode in which the gantry main body is tiltable in a first angle range and a second tilt mode in which the gantry main body is tiltable in a second angle range in which a tilt angle is greater than in the first angle range.
