Microscope with illuminating optical system

A microscope comprising:

• a close-up optical system that faces an object, one side of each lens included in said close-up optical system being cut out;
• at least one imaging optical system that takes object light rays passing through a region of said close-up optical system, said region being offset from the optical axis of the close-up optical system in the direction opposite to the cutout side;
• an illuminating optical system that guides illumination light emitted from a light source to illuminate said object;
• a first lens barrel that supports said close-up optical system;
• a second lens barrel that supports said illuminating optical system, said second lens barrel being arranged in the cutout space of said close-up optical system inside said first lens barrel;
• and
• a light shielding member attached to said second lens barrel to prevent a leak of the illumination light through grooves formed on said second lens barrel.