A lens module is disclosed. The lens module includes a lens barrel including a first barrel wall extended horizontally and a second barrel wall extended from the first barrel wall; a lens group including at least one lens, the lens includes a first slope; a stop on the first barrel wall and forming a light hole for the lens, and a pressing ring attached to the stop. The first barrel wall of the lens barrel includes a second slope abutting against the first slope for ensuring the concentricity.