An X-ray CT device which improves resolution in a peripheral region distant from a rotation center. According to an FFS method of moving an X-ray focal point, a gap width of projection positions on an X-ray detector of a first X-ray trajectory from the X-ray focal point of a first view and a second X-ray trajectory from the X-ray focal point of a second view is obtained. A position of the X-ray focal point of the first and second views is set so that a gap width 15 of the projection positions on the X-ray detector of the first X-ray trajectory and the second X-ray trajectory which pass through a point within a predetermined first region close to the X-ray focal point from the rotation center is closer to (N−½) times (N=any one of 1, 2, 3, . . . ) of a width of a channel of the X-ray detector.