For the purpose of allowing fat to be stably distinguished irrespective of individual differences, so as to prevent damage to nerves that surround a target organ, an image processing device includes: a fat-image-region extracting unit that extracts a fat-image region that indicates a region, in a living-tissue image, where fat exists a fat-color-component detecting unit that detects a fat-color-component amount that determines the color of fat, from the fat-image region extracted by the fat-image-region extracting unit and a correction unit that corrects the signal intensity of the fat-image region extracted by the fat-image-region extracting unit on the basis of the fat-color-component amount detected by the fat-color-component detecting unit.
