In order from the object side has a lens group of the second lens group of the first having a negative power, an aperture, having a positive power, in order from the object side, at least the concave surface on the image side, a first lens group constitute front group side negative lens toward the in front group side positive lens having a convex surface on the image side, in order from the object side, at least, a positive having a convex surface on the image side, a lens group of the second was constructed to meet the predetermined condition, the endoscope objective lens that is composed of a cemented lens and a positive lens and lens rear side lens group, a negative.物体側から順に、負のパワーを持つ第一のレンズ群、絞り、正のパワーを持つ第二のレンズ群を有し、第一のレンズ群を、物体側から順に、少なくとも、像側に凹面を向けた負の前群側レンズ、像側に凸面を向けた正の前群側レンズで構成し、第二のレンズ群を、物体側から順に、少なくとも、像側に凸面を向けた正の後群側レンズ、負のレンズと正のレンズとを接合した接合レンズで構成した内視鏡用対物レンズを、所定の条件を満たすように構成した。
