This endoscope has an observation optical system provided in a distal end of an inserted portion of the endoscope, for observation of an object, and plural illumination optical systems provided in the inserted portion, for illuminating a certain angle of view, wherein one illumination optical system having the widest light distribution is distant from the observation optical system relative to another illumination optical systems having the narrowest light distribution, and the following conditional expression is satisfied, 0.6 ‰¤ Æ S ‹ f W / Æ W ‹ f S ‰¤ 1.0 wherein f w is a focal length of the widest light distribution optical system, f s is a focal length of the narrowest light distribution optical system, Æ w is an outer diameter of the lens nearest to the object within the widest light distribution optical system, and Æ s is an outer diameter of the lens nearest to the object within the narrowest light distribution optical system.
