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； a CCD 2 picking up an image of a return light from the subject based on radiation of the illumination light from the light source device 4； an image processing section 101 outputting a first image signal P1 of a first wavelength band 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 CCD 2； and an observation monitor 5 performing image display on the basis of the first image signal.
