An X-ray computed tomography apparatus with a scanner function includes a vertical frame, a patient support arm provided below the vertical frame, a horizontal support arm extending horizontally from a top portion of the vertical frame, a rotary arm drive unit provided at an end of the horizontal support arm, a horizontal rotation arm provided horizontally below the rotary arm drive unit to rotate 360 degrees, a general CT imaging X-ray source provided at one end of the horizontal rotation arm, and an X-ray detector provided at the other end of the horizontal rotation arm to face the general CT imaging X-ray source. A micro CT imaging X-ray source is provided on the vertical frame, a rotary table for seating and rotating an object to be imaged is provided above the patient support arm, and the X-ray detector is composed of a common X-ray detector.