The invention provides an X-ray image generation device which can easily acquire phase contrast information in a plurality of directions in a large field of view. A movement mechanism (4) moves a subject (10) relative to a grid part (2) in a direction traversing the X-rays irradiated to the grid part (2). The grid part (2) has N (2 < = N) regions arranged in a direction along the movement direction of the movement mechanism (4). The periodic direction of the grid structure among the plurality of grids (21-23) belonging to the i-th (1 < = i < = N-1) region among the N regions is different from the periodic direction of the grid structure among the plurality of grids (21-23) belonging to the (i + 1)-th region among the N regions. The plurality of grids (21-23) are configured such that periodic intensity variations of Moire interference fringes generated in all N regions can be measured by the detector (3), and the plurality of grids (21-23) have intensity variations of at least one period or more in the moving direction of the movement mechanism (4).
X-ray image generation device