In order to provide an X-ray CT apparatus with a rotating portion that can withstand the tilt and high-speed rotation, a cylindrical portion 42, rotating part, the ring portion 41 at a position shifted from the center of the 32-rotation axis of the cylindrical portion 42 It is a structure that is placed, supporting them in the spokes 43 to 46. I want to fix the circuit device and one or more X-ray tube to the inner wall of the cylindrical portion 42. This makes it possible to place the center of the rotating shaft 32 of the cylindrical portion 42 the center of gravity of the circuit device and X-ray detection unit. It is possible to support in the vicinity of the center of the 32 direction of the axis of the cylindrical portion 42 the centrifugal force of the X-ray detection unit or the like, distortion is unlikely to occur in the cylindrical portion 42, it is possible to provide the rotating part to withstand the tilting and high-speed rotation.高速回転および傾斜に耐えうる回転部を備えたX線CT装置を提供するために、回転部は、円筒部42と、円筒部42の回転軸32方向の中心からずらした位置にリング部41を配置し、スポーク部43~46でこれらを支える構造である。円筒部42の内壁にX線管と1以上の回路装置を固定する。これにより、X線検出ユニットや回路装置の重心を円筒部42の回転軸32方向の中心位置に配置することができる。X線検出ユニット等の遠心力を円筒部42の軸32方向の中心付近で支えることができるため、円筒部42に歪みが生じにくく、高速回転やティルトに耐えうる回転部を提供できる。
