This endoscope has an observation optical system that switches its observation mode between magnified observation and normal observation by moving some lenses in an optical-axis direction； and a plurality of illumination optical systems, wherein lens surfaces at the most distal ends of the plurality of illumination optical systems are disposed closer to a proximal end than a lens surface at the most distal end of the observation optical system, and all of the lens surfaces at the most distal ends of the plurality of illumination optical systems are disposed substantially parallel to the lens surface at the most distal end of the observation optical system, wherein the following conditional expressions (1) to (3) are satisfied.1.0≦D_Back(far)/D_Back(near)<；3.0 (1)0.015<；D_Back(far)/D_far<；1.0 (2)1.01<；ω(wide)/ω(tele)<；5.0 (3)
