An X-ray computed tomographic apparatus includes an X-ray tube, an X-ray detector, a rotating mechanism unit which continuously rotates the X-ray tube around a subject to be examined, together with the X-ray detector, a data storage unit which stores projection data corresponding to an output from the X-ray detector in association with the angles of the X-ray tube at the time of data acquisition, a reconstruction processing unit which reconstructs a plurality of images on the basis of a plurality of projection data sets stored in the data storage unit, the plurality of projection data sets corresponding to the same range from a first view angle to a second view angle, and a display unit which displays the plurality of reconstructed images.