Abstract: A light projector for a distance measuring device comprises a lens barrel holding projecting lenses and a lamp housing rotatably engaged with the lens barrel. The lamp housing containing a flash lamp comprises a front cover having a tube engaged with the lens barrel, and a back cover secured to the front cover. In the front cover, a slit is provided, with its center aligned with an optical axis of the projecting lenses, the longitudinal sides thereof being arranged precisely perpendicular to a base line of a distance measuring device. Between the lamp housing and the lens barrel, an inclination adjusting member is disposed. When the inclination adjusting member is rotated with a screwdriver, or a wrench, the lamp housing rotates about the optical axis of the projecting lenses, permitting the inclination of the slit light to be adjusted.