A lens module includes a barrel, a first lens, a second lens, and a spacer. The first lens and the second lens are received in the barrel from an object side to an image side of the lens module. Each lens includes an optical portion and a non-optical portion around the optical portion. The spacer is positioned between the non-optical portion of the first lens and the non-optical portion of the second lens. The second lens includes an image-side surface. The non-optical portion on the image-side surface includes a contact portion. The contact portion defines a triangular notch.