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In many farm operations, implements must follow the rows of the crops. Doing this, the tractor operator must frequently looks back, twisting his body while checking the work being done. This is not only difficult, but also prone to errors. To improve this system and obtain labor savings, a study of an automatic crop row guidance system for use in tractor mounted implement was conducted. Specifically, a laser crop row sensor, which is the most important part of the guidance system, was developed. The sensor applied a three-dimensional vision sensor, consisting of a laser distance sensor, polygon mirror, electric motor and computer. It can measure the height of the crop rows through the computer and the rotating mirror, which detects the crop row position or tracking line marker drawn on the surface of the soil by a seeder. When mounted at a height of 250 - 350 mm from the surface, the sensor can measure the horizontal position of the surface objects 150 mm to either sides of the center position. A high degree of linearity was obtained between the object positions and the actual measurement values of the sensor, with a correlation coefficient of 0.999 or more within 80mm. With the sensor mounted in front of the tractor, and using the model row crop and the tracking line marker, the sensor was able to measure the position of model crops and lines within 10 mm error, which makes this system reliable as a crop row sensor.