| 摘要 |
An objective lens for endoscope comprises, in order from an object side, a front lens group having negative refractive power as a whole; a brightness aperture stop; and a rear lens group having positive refractive power as a whole, wherein said front lens group comprises in order from the object side, a first lens having negative refractive power; and a second lens group where a lens surface closest to the image side is convex form directed toward the image side, and it has positive refractive power as a whole; and the following condition (1) is satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>|f0/f1|<=1.1 (4)<?in-line-formulae description="In-line Formulae" end="tail"?> where f0 is a composite focal length of said front lens group, and f1 is a focal length of said the first lens.
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