Front group includes, in order from the object side, having negative refractive power consists of a rear group having a refractive power AS, positive the aperture stop, in order from the object side, the front group, a negative meniscus lens having a convex surface facing the object side It is the first lens L1, the second lens L2 of a negative lens having a concave surface facing the object side, the rear lens group, in order from the object side, a negative lens L4B third lens L3, and a positive lens L4A of the positive lens is bonded is a fourth lens L4, and the objective lens satisfies the following conditional expression (1), -0.8
