The invention is a lens module for a portable electronic device, comprising a lens cone formed with a hollow channel inside; a lens group held in the hollow channel, comprising plural lenses, the edge of each lens has plural mounting parts, each mounting part comprises a bump and a groove on two sides of the lens, and each lens is fastened with the adjacent lenses through the bump and groove so that all lenses are assembled together. The optical axis of the lens module is limited depending on the lens group itself instead of the lens cone, therefore reducing the optical axis deviation and improving the imaging quality. |