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 (151a, 151b) 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 (151a, 151b) 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 (151a, 151b) or a poly-prism mirror formed on a poly surface of the light reflecting surface (151a, 151b), 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 (151a, 151b). 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 (151a, 151b) 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 (151a, 151b) 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 (151a, 151b) or a poly-prism mirror formed on a poly surface of the light reflecting surface (151a, 151b), 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 (151a, 151b).