A medical X-ray CT imaging apparatus is capable of performing efficient CT imaging of living organs symmetrically located with respect to a predetermined plane. The medical X-ray CT imaging apparatus comprises an X-ray source (10), an X-ray detection means (20), a supporting means (30), a subject holding means (40), a rotation means (60r), a moving means (60), an imaging region specifying means for specifying imaging regions of a first living organ and a second living organ which are symmetrically located with respect to a predetermined plane, a calculation means which uses the moving means (60) and the rotation means (60r) to automatically and consecutively perform X-ray CT imaging of respective imaging regions of the first living organ and the second living organ, which are specified by the imaging region specifying means, and reconstructs respective CT images of the first living organ and the second living organ on the basis of electrical signals obtained by the X-ray CT imaging, and a display part (88) for displaying the CT images of the first living organ and the second living organ, which are obtained by the calculation means.