An apparatus for supporting an optical component that stably and precisely mounts the optical component for reflecting or permeating a beam emitted from a light source on a frame, and a laser scanner and an image forming device having the same, respectively. The laser scanner includes a light source, a reflective mirror to reflect a beam emitted from the light source, a supporting surface to support the reflective mirror in a predetermined orientation, and at least one horizontal reference surface and at least one vertical reference surface disposed in the supporting surface to provide reference surfaces for measuring a reflective point of the reflective mirror.