Provided is a practical vertical X-ray imaging device using a Talbot-Lau interferometry. The X-ray imaging device (1) is provided with an X-ray source (11), a multi-slit (12), a first grating (14) and a second grating (15), a drive unit (12a), a subject table (13), and an X-ray detector (16). The X-ray source (11), the multi-slit (12), the subject table (13), the first grating (14), the second grating (15), and the X-ray detector (16) are arranged in this order. Repeating a process wherein the drive unit (12a) moves the multi-slit (12) in a direction orthogonal to an X-ray application direction and the X-ray detector (16), whenever the multi-slit (12) is moved at regular periodical intervals, reads an image signal according to the X-ray applied by the X-ray source (11), a plurality of moire images at the regular periodical intervals are obtained.
