The endoscope apparatus includes: a first wavelength band light having a narrow-band spectral characteristics of between wavelengths including a minimum value from the wavelengths including the maximum value on the absorption characteristics of hemoglobin, than the light of the first wavelength band low absorption characteristics of the scattering characteristic and hemoglobin in a subject, a light source unit for generating a light of the second wavelength band is a wavelength longer than the light of the first wavelength band, corresponding to the light of the first wavelength band to the first image pickup signal is an image pickup signal of a subject, an imaging unit that generates a second image pickup signal is an image pickup signal of a subject corresponding to the light of the second wavelength band is generated in the imaging unit first, an image generating unit which generates an observation image of the subject from the second image pickup signal, a first spectral product reaching the imaging section from the light source unit in the first wavelength band, the light source at the second wavelength band has at least one of the spectral of the light of the second of the first wavelength band light and the second wavelength band to reach the image pickup unit from the light source unit so as to be within 50% to 150% of the spectral product, from unit to the imaging unit and a control unit for controlling the value of the product.内視鏡装置は、ヘモグロビンの吸光特性上で極大値を含む波長から極小値を含む波長間に狭帯域の分光特性を有する第1の波長帯域の光と、第1の波長帯域の光よりも被検体における散乱特性及びヘモグロビンの吸収特性が低く、第1の波長帯域の光よりも長波長である第2の波長帯域の光とを発生する光源部と、第1の波長帯域の光に対応する被検体の撮像信号である第1の撮像信号と、第2の波長帯域の光に対応する被検体の撮像信号である第2の撮像信号とを生成する撮像部と、撮像部において生成された第1、第2の撮像信号から被検体の観察画像を生成する画像生成部と、第1の波長帯域における光源部から撮像部に至る第1の分光積が、第2の波長帯域における光源部から撮像部に至る第2の分光積の50%~150%以内となるように光源部から撮像部にいたる第1の波長帯域の光及び第2の波長帯域の光のうち少なくとも一方の分光積の値を制御する制御部とを有する。
