1. An image processing device comprising: enhancement processing means configured to enhance a speckle pattern in an ocular fundus tomographic image; region-of-interest setting means configured to set a desired region in the ocular fundus tomographic image with the enhanced speckle pattern as a region-of-interest; feature value extracting means configured to extract a feature value of the speckle pattern in the region-of-interest; and disease determining means configured to make disease determination for an ocular fundus on a basis of the feature value; and mapping means configured to map, in the ocular fundus tomographic image, a site of the ocular fundus that is determined to have a disease by the disease determining means.