| 摘要 |
An objective lens for an endoscope includes a first lens group of a positive power having a plurality of lenses, and a second lens group of a negative power. The first lens group is provided with a negative first lens located adjacent to an object to be photographed. The objective lens meets the requirements defined by (1) 0.6<fF/f<1.0, (2)-6.0<fs/f<-1.0, and (3) 1.0<LD/f<4.0, where fF designates a focal length of the first lens group, fs designates a focal length of the second lens group, f designates a focal length of the whole lens system, and LD designates a sum of the whole lens length and back focal distance.
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