An X-ray positioning apparatus that controls a patient platform by use of an X-ray image so as to position a diseased site of a patient at a radiation irradiation position planned in a treatment plan, the X-ray positioning apparatus comprising: - an X-ray video device that obtains first X-ray image data (data1) output from an X-ray detector for detecting an X-ray radiated by an X-ray tube and generates second X-ray image data (data2) in which a respiratory signal (sigl) related to respiration of the patient and the first X-ray image data (data1) are related to each other; - a positioning computer that compares a diseased site in the second X-ray image data (data2) with a diseased site in a reference image, which is a positioning reference, calculates a postural correction amount in such a way that an actual posture coincides with a posture in the treatment plan, and then generates patient platform control data (cdatal) for controlling the patient platform; and - a photographing trigger generation apparatus that outputs a photographing trigger signal for radiating X-rays in accordance with two or more frame rates (frl, fr2) to the X-ray tube, based on the respiratory signal (sigl) and a frame rate control signal including photographing conditions for consecutively photographed images (28, 29) in the first X-ray image data (data1), - wherein the photographing trigger generation apparatus generates the photographing trigger signal, in accordance with a first frame rate and a second frame rate that is higher than the first frame rate, and - wherein the positioning computer generates the patient platform control data (cdatal), based on the reference image and one X-ray image selected from the consecutively photographed images, in the second X-ray image data (data2), that are photographed at the second frame rate, wherein the photographing trigger generation apparatus includes a waveform determination unit that determines whether or not a waveform of the respiratory signal (sigl) is in a predetermined state, an attentional period extraction unit that extracts an attentional period (Ts) where based on a result of determination by the waveform determination unit, the consecutively photographed images are taken at the second frame rate, and a photographing trigger generation unit that outputs the photographing trigger signal, based on a photographing period (Tp) and the attentional period (Ts) in the frame rate control signal. - an X-ray video device that obtains first X-ray image data (data1) output from an X-ray detector for detecting an X-ray radiated by an X-ray tube and generates second X-ray image data (data2) in which a respiratory signal (sigl) related to respiration of the patient and the first X-ray image data (data1) are related to each other; - a positioning computer that compares a diseased site in the second X-ray image data (data2) with a diseased site in a reference image, which is a positioning reference, calculates a postural correction amount in such a way that an actual posture coincides with a posture in the treatment plan, and then generates patient platform control data (cdatal) for controlling the patient platform; and - a photographing trigger generation apparatus that outputs a photographing trigger signal for radiating X-rays in accordance with two or more frame rates (frl, fr2) to the X-ray tube, based on the respiratory signal (sigl) and a frame rate control signal including photographing conditions for consecutively photographed images (28, 29) in the first X-ray image data (data1), - wherein the photographing trigger generation apparatus generates the photographing trigger signal, in accordance with a first frame rate and a second frame rate that is higher than the first frame rate, and - wherein the positioning computer generates the patient platform control data (cdatal), based on the reference image and one X-ray image selected from the consecutively photographed images, in the second X-ray image data (data2), that are photographed at the second frame rate,