PROBLEM TO BE SOLVED: To reduce the size of an imaging part composed of an object lens for endoscope and an image pickup device.SOLUTION: In an object lens for endoscope in which a reflection member for bending an optical path approximately at a right angle is inserted between a lens final surface and an image pickup device arranged on an image surface, an effective diameter of the lens final surface is made smaller than a dimension in a direction corresponding to the bending direction of the optical path of the image pickup device and satisfies the following conditional expression (1): h1<；V+0.4.【課題】内視鏡用対物レンズと撮像素子からなる撮像部の小型化を図る。【解決手段】レンズ最終面と像面に配される撮像素子との間に、光路を略直角に折り曲げる反射部材が挿入された内視鏡用対物レンズにおいて、レンズ最終面の有効径を、撮像素子の光路折り曲げ方向に対応した方向の寸法より小さくし、かつ下記条件式を満足するようにする。ｈ１＜Ｖ＋０．４ …（１）【選択図】図１
