An endoscope apparatus 1 includes: a light source device 4 radiating at least one or more illumination lights having a predetermined wavelength band to a subject, an image pickup device 2 picking up an image of a return light from the subject based on radiation of the light source device 4, a video processor 7, and an observation monitor 5. A band decomposition processing section 104 of the video processor 7 performs processing for decomposition into multiple spatial frequency bands, for a first image signal P 1 having a peak wavelength of spectral characteristic, between a wavelength band including a maximum value and a wavelength band at a minimum value with regard to an absorption characteristic of living tissue after image pickup by the image pickup device 2. An emphasis processing section 101a of the video processor 7 performs emphasis processing on the basis of a band image signal with a lowest spatial frequency among multiple band image signals obtained by the decomposition processing to generate an emphasis-corrected image signal.
