A distance measurement apparatus to measure distance to a target by irradiating laser beams to the target and receiving a reflection light reflected from the target, the distance measurement apparatus comprising: a light projection unit including a plurality of light emission units to project a plurality of laser beams onto the target while setting optical paths of the plurality of laser beams radially along a given virtual plane; and a light receiving unit including a plurality of light receivers to receive the plurality of laser beams, projected from the light projection unit and reflected by the target, wherein each of the plurality of laser beams projected from the light projection unit has a given divergence angle along the virtual plane, characterized in that the divergence angle ranges from 20 degrees to 40 degrees and in that the plurality of light emission units is disposed separately along the virtual plane, wherein each of the light emission units includes: a light source; and a projection optical system disposed on an optical path of the laser beam emitted from the light source, wherein the projection optical system includes a coupling lens and a cylindrical lens to shape the laser beam emitted from the light source, wherein the coupling lens is disposed on the optical path of the laser beam emitted from the light source to set the laser beam as substantially parallel light, and wherein the cylindrical lens is disposed on the optical path of the laser beam after the coupling lens to diffuse the laser beam in a direction parallel to the given virtual plane. a light projection unit including a plurality of light emission units to project a plurality of laser beams onto the target while setting optical paths of the plurality of laser beams radially along a given virtual plane; and a light receiving unit including a plurality of light receivers to receive the plurality of laser beams, projected from the light projection unit and reflected by the target, wherein each of the plurality of laser beams projected from the light projection unit has a given divergence angle along the virtual plane, characterized in that the divergence angle ranges from 20 degrees to 40 degrees and in that the plurality of light emission units is disposed separately along the virtual plane, wherein each of the light emission units includes: a light source; and a projection optical system disposed on an optical path of the laser beam emitted from the light source, wherein the projection optical system includes a coupling lens and a cylindrical lens to shape the laser beam emitted from the light source, wherein the coupling lens is disposed on the optical path of the laser beam emitted from the light source to set the laser beam as substantially parallel light, and wherein the cylindrical lens is disposed on the optical path of the laser beam after the coupling lens to diffuse the laser beam in a direction parallel to the given virtual plane. a light source; and a projection optical system disposed on an optical path of the laser beam emitted from the light source, wherein the projection optical system includes a coupling lens and a cylindrical lens to shape the laser beam emitted from the light source, wherein the coupling lens is disposed on the optical path of the laser beam emitted from the light source to set the laser beam as substantially parallel light, and wherein the cylindrical lens is disposed on the optical path of the laser beam after the coupling lens to diffuse the laser beam in a direction parallel to the given virtual plane.