The number of lenses within an objective lens for endoscopes is only three. The objective lens for endoscopes includes, in order from the object side, a first lens which is a single lens having a negative refractive power and a concave surface toward the object side, an aperture stop, and a cemented lens. The cemented lens is formed by cementing one positive lens and one negative lens together. Conditional formulae related to the distance from the surface toward the object side of the first lens to the aperture stop and the Abbe's numbers of the positive lens and the negative lens that constitute the cemented lens are satisfied.
