PROBLEM TO BE SOLVED: To obtain a phase differential image from which striped noises generated by an unwrapping error are removed.SOLUTION: A radiographic apparatus includes: a statistical operation processing unit 41 which applies statistical operation processing to actually-taken image data 52 obtained by stripe scanning a phase differential image generating unit 40 which generates a differential image K1 of first phase having a pixel value superimposed on a range of a width α, on the basis of the actually-taken image data 52, and which generates a differential image K2 of second phase on the basis of the actually-taken image data 52 subjected to the statistical operation processing an unwrapping processing unit 42 which applies unwrapping processing to the differential images K1 and K2 of first and second phases and a corrective processing unit 44 which corrects an error in the unwrapping processing by calculating a difference Δ between the differential images K1 and K2 of first and second phases subjected to unwrapping processing, calculating an integer n, satisfying the inequality, nα-α/2≤Δ
