A panoramic tomography X-ray apparatus (100) includes an image information processing part (801b), a display part (81), and a position setting part (801 a). The image information processing part (801 b) retrieves frame image information from a storage part (802) and superimposes overlapped portions of images along a tomographic plane corresponding to a dental arch to generate a panoramic tomographic image. The display part (81) displays the panoramic tomographic image generated by the image information processing part (801b). The position setting part (801a) sets, in a median portion including a median line of an object (M1), the position of the tomographic plane regarding a depth direction of the object.
