Abstract: A lens module includes: a barrel having a stepped portion including first and second stepped surfaces, wherein the first stepped surface is closer to a central axis than the second stepped surface; a front cover including a first portion and a second portion, wherein the first portion corresponds to the first stepped surface, the second portion corresponds to the second stepped surface, and the barrel is disposed in the front cover; an optical lens assembly disposed in the barrel and including a first lens, wherein an annular accommodating space is formed by an outer annular surface of the first lens, the first stepped surface of the barrel, and the first portion of the front cover; and an adhesive disposed in the annular accommodating space and in contact with the outer annular surface of the first lens, the first stepped surface, and the first portion.