1. An image processing device comprising: a tomographic image generating section that acquires a plurality of first radiographic images from a radiographic image detector, the first radiographic images are captured by the radiographic image detector by irradiating radiation, from a radiation irradiating section that is provided so as to face the radiographic image detector, from different angles with respect to a subject that is on the radiographic image detector, and generates a plurality of tomographic images of the subject by reconstructing the plurality of first radiographic images using a detection surface of the radiographic image detector as a reference; a display processing section that displays on a display section a second radiographic image that is acquired by the radiographic image detector by irradiating radiation from the radiation irradiating section from a predetermined angle with respect to the subject on the radiographic image detector; and a detection section that, (a) when a region of interest including an object of interest is specified on the displayed second radiographic image, performs image analysis by comparing the region of interest with corresponding regions that are regions in the plurality of tomographic images corresponding to the region of interest, and detects a tomographic image including a corresponding region that is similar to the region of interest based on a result of the image analysis, and (b) when a position of interest of the object of interest is specified on the second radiographic image, performs image analysis by comparing the position of interest with corresponding positions that are positions in the plurality of tomographic images corresponding to the position of interest, and detects a tomographic image including a corresponding position that is similar to the position of interest based on a result of the image analysis, wherein when a size of the region of interest is equal to or greater than a predetermined size, the detection section performs image analysis based on pixel values of pixels of the region of interest and on pixel values of pixels of the corresponding regions.