A panoramic tomography X-ray apparatus including an image information processing part, a display part, and a position setting part. The image information processing part retrieves a frame image information from a storage part and superimposes overlapped portions of images along a tomographic plane corresponding to a dental arch to generate a panoramic tomographic image. The display part displays the panoramic tomographic image generated by the image information processing part. The position setting part sets, in a median portion including a median line of an object, the position of the tomographic plane regarding depth direction of the object.
