Manufacturing errors are suppressed, a variable magnification function is provided, and good observation with aberrations appropriately corrected is performed. Provided is an endoscope objective lens (10) including, in order from an object side, a positive first lens group (1), a negative second lens group (2), and a positive third lens group (3), in which the first lens group (1) has a meniscus lens (13)； and a normal observation state (wide angle end) and a magnifying observation state (telephoto end) can be switched between by moving the second lens group (2) on the optical axis, and the following conditions are satisfied； -9<；f2/fW<；-3.54.5<；fM/fW<；50 where fM represents the focal distance of the meniscus lens, fw represents the entire focal distance for the normal observation, and f2 represents the focal distance of the second lens group.
