An X-ray CT scanner 1 generates CT imaging information I on an imaging region CA. The X-ray CT scanner 1 includes a revolution arm 30 locating an X-ray generator 10 and an X-ray detector 20 such that the X-ray generator 10 and the X-ray detector 20 face each other while having a subject M1 therebetween；an XY table 35 moving the revolution arm 30 such that an irradiation direction of an X-ray cone beam Bx is offset from the center of the imaging region CA； an axial direction changing mechanism 43 changing the imaging target from a first imaging region R1 to be processed by the imaging first to a second imaging region R2 in a Z-axis direction； a main body controller 60 controlling the X-ray CT imaging； and a stitch image information generator 861b generating stitch imaging information Is. The main body controller 60 is configured to be capable of executing control on the XY table 35 and the offset CT imaging, and control on the axial direction changing mechanism 43 to generate first CT imaging information I1 and second CT imaging information I2. The stitch image information generator 861b generates the stitch imaging information Is from offset CT imaging information Iο based on the first CT imaging information I1 or the like acquired by offset CT imaging.
