To provide an X-ray measuring instrument capable of obtaining a panorama tomographic image having a thickness in the direction (the depth direction) perpendicular to a body axis of a subject.

The orbit 401 of a panorama tomographic image forming area is set with a function, and a first point to be noted 402 is set on the orbit at prescribed interval, and also a second point to be noted 503 is set on a line through which the point to be noted 402 and the deployment center 400 are connected. An X-ray source position 404 where the normal 403 of the orbit 401 passes, and a position 406 on a detector 405 are obtained concerning the first point to be noted, and data within an angular range around the positions are added by weighting so as to be defined as tomographic data of the first point to be noted 402. The same processing is performed relative to the second point to be noted so as to obtain the tomographic data of the second point to be noted 503. The kinds of tomographic data are added by weighting so as to be defined as the final tomographic data of the first point to be noted 402. The same processing is performed relative to the points to be noted on the orbit 401 and the final tomographic data of each point to be noted are made to be stuck together, so that panoramic image data is generated.

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