Abstract: A two-dimensional laser triangulation sensor for measuring small diameter holes. The housing of the sensor is cylindrical and consists of two coaxial cylindrical parts, joined by their ends. The cylindrical parts of the housing have different diameters, and an optical circuit of the sensor is disposed in the cavity of the larger diameter cylindrical part of the sensor housing, said optical circuit consisting of a laser emitter, an electronic printed circuit board with a built-in CMOS array, and a focusing lens, which is mounted at an angle to the electronic printed circuit board. The larger diameter cylindrical part of the housing is provided with an aperture, in which a protective glass is mounted. A power supply and computation unit is disposed in the cavity of the smaller diameter cylindrical part of the housing.