The endoscope of the present invention (1) is provided with magnifying observation and normal observation and can switch observation optical system (3), a plurality of illumination optical systems and (4A, 4C), an illumination optical system (4A, 4C state-of-the-art lens surface) (4a, 4c) are observation optical system (3) of the cutting edge of the lens surface while being positioned proximal to the (3a), all of the illumination optical system (4A, 4C) cutting edge of the lens surfaces (4a, 4c) of, arranged substantially parallel to leading edge of the lens surface and (3a) of the observation optical system (3), satisfies the following conditional expression 1.0 D_Back (far) / D_Back (near) <3.0 0.015
