Patent ID: 8284481

Claim:
An objective lens to be fitted into a fitting hole of a nosepiece of a microscope comprising: an imaging lens that is composed of a plurality of lens groups; and a lens barrel that holds the imaging lens; said plurality of lens groups including a first lens group which, when the objective lens is fitted in the fitting hole of the nosepiece and is an observed position, is disposed nearest to a specimen and a second lens group which, when the objective lens is fitted in the fitting hole of the nosepiece and is in an observed position, is disposed farthest from the specimen; the lens barrel being formed as a single piece having, as a part thereof, a connecting portion that is to be received in the fitting hole of the nosepiece at a position on an outer circumference of the lens barrel that is closer to an end of the lens barrel nearest to the specimen than to an opposite end of the lens barrel, that is closer to said first lens group than to said second lens group, and having, as a part thereof, a mount surface that is located adjacent to said connecting portion, and that abuts the nosepiece when the connecting portion is received in the fitting hole of the nosepiece.