An apparatus for measuring a distance, the apparatus comprising: a tilting base mounted with a light transmitter configured to transmit a light and a light receiver including a photo-detector on which a spot of the light is formed ; and a rotating reflector configured to reflect the light emitted from the light transmitter to an object and to reflect the light reflected or dispersed from the object to the light receiver , wherein the light receiver includes a light receiving lens configured to concentrate the light dispersed or reflected from the object , and a photo-detector configured to detect a position of the object using the light, wherein the reflector includes a light reflecting surface configured to reflect the light emitted from the light transmitter to the object , and to reflect the light reflected or dispersed from the object to the light receiver , the light transmitter including a light source and a collimation lens configured to make the light emitted from the light source parallel light, the light reflecting surface being slanted to a rotation shaft of the reflector , the reflector being a double-sided mirror formed on two sides of the light reflecting surface or a poly-prism mirror formed on a poly surface of the light reflecting surface , the base being tilted in a direction perpendicular to an optical axis of the light emitted from the light transmitter and an axis of rotation of the reflector , the photo-detector being an image sensor including a plurality of unit pixels arranged in 'n × m' matrix to convert an optical signal by the light to an electric signal, the spot being formed on unit pixels of a plurality of lines of the image sensor and the light being reflected at a different angle from a front state and a rear surface state of the light reflecting surface . a tilting base mounted with a light transmitter configured to transmit a light and a light receiver including a photo-detector on which a spot of the light is formed ; and a rotating reflector configured to reflect the light emitted from the light transmitter to an object and to reflect the light reflected or dispersed from the object to the light receiver , wherein the light receiver includes a light receiving lens configured to concentrate the light dispersed or reflected from the object , and a photo-detector configured to detect a position of the object using the light, wherein the reflector includes a light reflecting surface configured to reflect the light emitted from the light transmitter to the object , and to reflect the light reflected or dispersed from the object to the light receiver , the light transmitter including a light source and a collimation lens configured to make the light emitted from the light source parallel light, the light reflecting surface being slanted to a rotation shaft of the reflector , the reflector being a double-sided mirror formed on two sides of the light reflecting surface or a poly-prism mirror formed on a poly surface of the light reflecting surface , the base being tilted in a direction perpendicular to an optical axis of the light emitted from the light transmitter and an axis of rotation of the reflector , the photo-detector being an image sensor including a plurality of unit pixels arranged in 'n × m' matrix to convert an optical signal by the light to an electric signal, the spot being formed on unit pixels of a plurality of lines of the image sensor and the light being reflected at a different angle from a front state and a rear surface state of the light reflecting surface . <EOS>