An X-ray computed tomography apparatus with a scanner function, comprising: a vertical frame; a patient support arm comprising a jaw fixing portion for supporting the head of a patient 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 so that the apparatus can perform a general CT imaging operation, wherein X-ray is irradiated from the general CT imaging X-ray source while rotating the horizontal rotation arm around the head of the patient placed on the patient support arm, characterized by: a micro CT imaging X-ray source which is further provided on the vertical frame, and a rotary table for seating and rotating an object to be imaged which is further provided above the patient support arm such that the centers of the micro CT imaging X-ray source and the rotary table are aligned with each other, wherein the X-ray detector is composed of a common X-ray detector capable of being rotated by an X-ray detector drive unit such that the micro CT imaging X-ray source and the common X-ray detector are caused to face each other, so that the apparatus can perform a micro CT imaging operation, wherein an X-ray is irradiated from the micro CT imaging X-ray source while rotating the rotary table. a vertical frame; a patient support arm comprising a jaw fixing portion for supporting the head of a patient 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 so that the apparatus can perform a general CT imaging operation, wherein X-ray is irradiated from the general CT imaging X-ray source while rotating the horizontal rotation arm around the head of the patient placed on the patient support arm, characterized by: a micro CT imaging X-ray source which is further provided on the vertical frame, and a rotary table for seating and rotating an object to be imaged which is further provided above the patient support arm such that the centers of the micro CT imaging X-ray source and the rotary table are aligned with each other, wherein the X-ray detector is composed of a common X-ray detector capable of being rotated by an X-ray detector drive unit such that the micro CT imaging X-ray source and the common X-ray detector are caused to face each other, so that the apparatus can perform a micro CT imaging operation, wherein an X-ray is irradiated from the micro CT imaging X-ray source while rotating the rotary table. a micro CT imaging X-ray source which is further provided on the vertical frame, and a rotary table for seating and rotating an object to be imaged which is further provided above the patient support arm such that the centers of the micro CT imaging X-ray source and the rotary table are aligned with each other, wherein the X-ray detector is composed of a common X-ray detector capable of being rotated by an X-ray detector drive unit such that the micro CT imaging X-ray source and the common X-ray detector are caused to face each other, so that the apparatus can perform a micro CT imaging operation, wherein an X-ray is irradiated from the micro CT imaging X-ray source while rotating the rotary table.