To provide a digital radiation image imaging system capable of edge being an effect of a phase contrast radiography even an image is formed at any phase (position) on a reading control unit. In a digital radiation image radiographing system which comprises an X-ray tube to irradiate a radiographic subject with X-rays and a digital detector to detect X-rays having passed through the above-mentioned radiographic subject and performs a phase contrast radiography, when D (µm) represents the focal size of the above-mentioned X-ray tube, S (µm) represents the minimum control unit of the above-mentioned digital detector, R1 (m) represents a distance from the focus point of the above-mentioned X-ray tube to the above-mentioned radiographic subject, R2 (m) represents a distance from the above-mentioned radiographic subject to the above-mentioned digital detector, M represents an enlargement ratio of M=(R1+R2)/R1 and E represents an edge enhancement width according to X-ray refraction, the formula of (D ‰¥ 2S/(M - 1)) is satisfied.
