Provided is an image processing device, an image processing method, and a program which can prevent a total processing time from significantly increasing while maintaining precision of image processing at a high level, where an image acquiring section sequentially acquires images generated by imaging a predetermined subject to be imaged; an image processing executing section executes, in each of sequentially-arriving processing periods, image processing on the image acquired by the image acquiring section; a preprocessing execution result output section outputs an execution result of preprocessing performed on the image in part of the sequentially-arriving processing periods, the image having been acquired by the image acquiring section before the part of the sequentially-arriving processing periods; an execution result holding section keeps holding the execution result output by the preprocessing execution result output section at least until the execution result is output next time by the preprocessing execution result output section; and the image processing executing section executes the image processing by applying the execution result held in the execution result holding section to the image acquired by the image acquiring section.