Endoscope

An endoscope comprising:

• an observation optical system provided in a distal end of an insertion portion, the observation optical system including a plurality of lenses and having a function that allows a magnified observation close to a subject;
• and
• a plurality of illumination optical systems provided in the distal end of the insertion portion, the plurality of illumination optical systems each including a plurality of lenses and illuminating the subject with illuminating light,
• wherein the plurality of illumination optical systems include a first illumination optical system and a second illumination optical system different from the first illumination optical system,
• each of the first and second illumination optical systems satisfies the following conditional expression (3),
• in a close observation in which a distance between a distal end face of the insertion portion and the subject is an arbitrary distance of from 1.5 mm to 2.5 mm, where ITM is a maximum brightness within an observation view field angle and ITC is a center brightness, and
• in a normal observation in which the distance between the distal end face of the insertion portion and the subject is 50 mm, where IWC is a center brightness and IWS is a brightness at a position of 80% of a maximum view angle, the following conditional expressions are satisfied:
• 0.3<ITC/ITM<0.45 (1);
• 0.15<IWS/IWC<0.25 (2);
• and
• 0.3<fLfT/φLIH<0.6 (3),
• where fL is a focal length of each of the entire illumination optical systems, fT is a focal length of the entire observation optical system in a maximum magnification, φL is an outer diameter of a lens that is farthest on an object side of each illumination optical system, and IH is a maximum image height of the observation optical system.