1. An image processing device comprising: average image producing means for producing an average image from all or some of a plurality of images captured at the same location; noise extracting means for extracting a noise pixel on the basis of the result of a comparison between the pixel values of the pixels in the captured images and the pixel values of the pixels at the same position in the average image; and interpolating means for interpolating the pixel value of the noise pixel included in the captured images using the pixel values of other pixels to produce a noise-eliminated image.