PROBLEM TO BE SOLVED: To acquire information for correcting an error in a body thickness distribution of a subject image representing a subject with influence of scattered radiation generated due to an imaging environment in a predetermined imaging environment in an image analysis device, method and program.SOLUTION: A radiation image analysis device comprises: an image acquisition section 33 which acquires a reference image being a radiation image captured without arranging a subject in a predetermined imaging environment and a correction distribution acquisition section 35 which estimates the body thickness distribution of a virtual subject of the reference image on the basis of a scattered radiation component included in the reference image by considering that the scattered radiation component included in the acquired reference image is generated by the virtual subject representing an imaging environment of the reference image, and acquires the estimated body thickness distribution of the virtual subject as a correction distribution of the reference image being a distribution of a body thickness correction amount for correcting the error in the body thickness distribution of the subject image being a radiation image captured with a desired subject arranged in the imaging environment.
