a plastic barrel surrounding the optical axis to form an accommodating space, wherein the plastic barrel comprises a first contacting surface, which is close to an image-side end of the plastic barrel;

an optical lens assembly disposed in the accommodating space of the plastic barrel and comprising a plurality of optical lens elements;

an image-side assembled element disposed close to the image-side end of the plastic barrel and comprising an opening structure, wherein the image-side assembled element is in a tube shape and extends in a direction from the object side to the image side, the image-side assembled element surrounds the optical axis and is disposed together with the plastic barrel, the image-side assembled element further comprises a second contacting surface and an inner protruding portion, the second contacting surface is disposed close to an object-side end of the image-side assembled element and correspondingly to the first contacting surface, the inner protruding portion extends toward the optical axis, and a minimum opening of the image-side assembled element is located at the inner protruding portion; and

a light blocking element assembly disposed in the image-side assembled element and comprising a light blocking element, wherein the light blocking element is abutted with an annular wall of the inner protruding portion;

wherein no any optical lens element is disposed in the image-side assembled element;

wherein the image-side assembled element further comprises a plurality of wedge structures, which are regularly arranged along a circumferential direction of the optical axis, and each of the wedge structures is tapered toward the optical axis.