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 < f 2 / f W < - 3.5 4.5 < f M / f W < 50 where f M represents the focal distance of the meniscus lens, f w represents the entire focal distance for the normal observation, and f 2 represents the focal distance of the second lens group.