PROBLEM TO BE SOLVED: To accelerate simple image processing display.SOLUTION: A radiation imaging apparatus comprises: a signal processing circuit for converting an electric charge signal imaged by an imaging element into a digital signal a selector circuit for applying thinning control of the converted signal data according to a thinning transfer rate and a display control section for displaying image data subjected to dark current correction on the basis of signal data with respect to dark current of the imaging element converted by the signal processing circuit and signal data subjected to the thinning control as a simple display image.