The instant invention relates to a seed drill fitted with a tip-up seed hopper which rotates around a horizontal axis in such a way that the seed outlets are always facing upwards during the mixing stage and/or until the actual sowing begins. The seed drill is characterised by a feedbox with a semi-circular bottom, having a longitudinal raised chamber situated externally to the longitudinal hinge of its lid. Said chamber is as long as the hopper itself and connected to its semi-circular bottom by an inclined plane. The exteynal wall of said raised chamber is provided with equidistant outlets, each with a distribution device and a regulator valve and stop.
