The invention relates to a combined panoramic and computed tomography photographing apparatus, including: an X-ray source part, an X-ray sensor part having a panoramic sensor and/or a CT sensor, a rotary arm for arranging the X-ray source part and the X-ray sensor part thereon in such a way as to be opposed to each other, a rotary arm supporting member, and rotary arm driving means, wherein the panoramic sensor and the CT sensor are dedicated sensors respectively for panoramic photographing and CT photographing, the X-ray sensor part further includes a first sensor mounting part for mounting the panoramic sensor and a second sensor mounting part for mounting the CT sensor, the first sensor mounting part is disposed at a portion which is near to the X-ray source part, and the second sensor mounting part is disposed at a portion which is away from the X-ray source part. In case of the CT, the panoramic sensor is separated from the first sensor mounting part or the first sensor mounting part on which the panoramic sensor is mounted slides in a predetermined direction, thus the X-ray generated by the X-ray source part is not detected. Through one photographing apparatus, a CT image and a panoramic image can be obtained, then a user can previously sets the optimum enlargement ratio according to panoramic photographing or CT photographing.