An endoscope apparatus includes an imager that outputs an imaging signal and an image processor that generates an emphasis image signal and a non-emphasis image signal based on the imaging signal. The emphasis image signal corresponds to emphasis narrow band light included in an emphasis wavelength range that includes at least one of a maximum wavelength that takes a maximum value of an optical absorption spectrum and a color-range largest wavelength that takes a largest value of the optical absorption spectrum. The non-emphasis image signal corresponds to non-emphasis narrow band light included in a non-emphasis wavelength range that excludes the emphasis wavelength range from three color ranges and that is included in a color range that does not include the emphasis narrow band light.
