PROBLEM TO BE SOLVED: To provide a radiation image detector that improves the accuracy of phase information in radiation phase imaging of a subject.SOLUTION: A radiation image detector 30 includes radiation shielding units 31b that form a radiation image including a periodic intensity distribution with radiations passing therethrough, an image receiving unit 41 that has a plurality of pixels 40, which detect radiations and accumulate charges, arranged in matrix, and a support body 31a that supports the image receiving unit 41. The radiation image detector 30 detects a radiation image with the image receiving unit 41 and creates image data including a periodic pattern based on the periodic intensity distribution included in the radiation image. The radiation shielding units 31b are formed on the support body 31a.【課題】被写体の放射線位相イメージングにおける位相情報の精度を高める放射線画像検出器を提供する。【解決手段】通過する放射線によって周期的強度分布を含む放射線像を形成する放射線遮蔽部３１ｂと、放射線を検出して電荷を蓄積する複数の画素４０が行列状に配列されてなる受像部４１と、受像部４１を支持する支持体３１ａとを、備え、受像部４１によって放射線像を検出し、該放射線像に含まれる周期的強度分布に基づく周期パターンを含む画像データを生成する放射線画像検出器３０であって、放射線遮蔽部３１ｂは、支持体３１ａに形成されている放射線画像検出器３０。【選択図】図５
