A lens barrel assembly of a camera module and a laser apparatus for assembling the lens barrel assembly are provided. The lens barrel assembly of a camera module includes: at least one lens; a barrel provided with a lens exposing hole having a predetermined size which is formed to penetrate a central portion of a closed upper surface of the barrel, wherein the lens is inserted from an lower opening of the barrel toward the lens exposing hole; and a stopping protrusion which is formed by fuse-securing a fused material on a boundary region between an outer circumference of the lens and an opened inner surface of the barrel by illumination of a laser beam on the opened inner surface of the barrel.