keeping production errors, it has a variable magnification function, and aberration appropriately performed corrected good observation. The first lens unit 1 in order a positive from the object side, a negative second lens group 2 and a positive third lens group 3, the first lens group 1 has a meniscus lens 13, a second lens group 2 light by moving the on-axis, and the normal observation state proximity magnified observation state (telephoto end) and (wide angle end) can be switched to provide a meet endoscope objective lens 10 below. -9