| 摘要 |
A microscope objective lens is provided as a semi-apochromatic microscope objective lens which has a magnification of about 40, has favorably corrected various kinds of aberration, and can also be used for observing fluorescence under downward radiation. The microscope objective lens comprises, successively from the object side, a positive meniscus lens component G1 having a concave surface directed onto the object side, a positive meniscus cemented lens component G2 having a concave surface directed onto the object side, a biconvex lens component G3, a cemented lens component G4 having, at least, a negative lens and a biconvex lens, and a negative meniscus cemented lens component G5 having a concave surface directed onto the image side, wherein the following conditions: 0.1<r1/r3<0.3-30<f2/f1<-105<D/f<8.5are satisfied.
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