The present disclosure provides a lens module. The lens module includes a lens barrel including a first barrel wall forming an optical aperture and a second barrel bending and extending from the first barrel wall. The second barrel wall includes a first inner wall and a first outer wall opposite to the first inner wall. One lens is arranged in the lens barrel, and the lens includes a side wall connecting an object side and an image side, a part of the side wall from the lens attaching to the first inner wall. A gap is formed between another part of the side wall and the first inner wall. A size of the part forming the gap between the side wall and the first inner wall along a direction of an optical axis accounts for at least one second of a total height.