In a stereoscopic endoscope apparatus, images obtained by left-eye and right-eye imaging systems are shaded differently due to subtle difference in an illumination direction, making fusion difficult. An endoscopic system includes: a stereoscopic endoscope which includes a light source of illumination light configured to illuminate inner part of a test object, an illumination window configured to emit the illumination light, and two or more imaging systems configured to image the inner part of the test object illuminated by the illumination light and an illuminance distribution changing unit configured to change an illuminance distribution of the illumination light so as to reduce a difference in luminance distribution between/among pictures sensed by the respective imaging systems.
