In order to appropriately detect an x-ray focal point position even when the x-ray focal point position moves due to heat, provided is an x-ray computed tomography device that comprises a slit member 110 wherein a small hole through which x-rays from an x-ray tube device 101 passes is formed, a detector for measuring focal point position 111 that detects the position of the focal point of the x-rays, and a control unit 108, wherein the detector for measuring focal point position 111 detects the amount of x-rays incident in each of a plurality of detection regions 111a, 111b, and the control unit 108 finds the amount of displacement of the x-ray focal point position with respect to an x-ray focal point reference position by comparing the detected values for the plurality of detection regions 111a, 111b and varies the relative positions of the slit member 110 and the detection regions 111a, 111b of the detector for measuring focal point position 111.
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