Seeder having a support intended, in a service position, to be drawn by an agricultural vehicle in a direction of forward travel, the seeder having: - an opening disc mounted to rotate, on the support, about an opening disc pivot of axis O, so as to create a furrow in the ground; - a seed dropper rigidly fastened to the support and configured to, in the service position, deposit a compound in the furrow; - a closing wheel mounted to rotate, on the support, about a closing wheel pivot of axis F, so as to close, at least partially, the furrow in which the compound has been deposited, the opening disc, the seed dropper and the closing wheel being successively mounted, from the front towards the rear, on the support, the support having - a base for fastening to the agricultural vehicle, - a share, disposed between the opening disc and the seed dropper, the support having a rocker mounted to rotate on the base about a rocker pivot of axis B, the rocker bearing respectively the opening disc pivot and closing wheel pivot, such that, in the service position, if the opening disc or the closing wheel lifts, the reaction of the ground on the closing wheel or the opening disc, respectively, tends to return the opening disc or the closing wheel, respectively, towards the ground, the axes O, F and B extending in respective transverse planes perpendicular to the direction of forward travel of the seeder, the transverse plane P in which the axis B extends separating the opening disc pivot and the closing wheel pivot, the seeder being characterized in that the seed dropper and/or the share is/are fastened rigidly to the base. - an opening disc mounted to rotate, on the support, about an opening disc pivot of axis O, so as to create a furrow in the ground; - a seed dropper rigidly fastened to the support and configured to, in the service position, deposit a compound in the furrow; - a closing wheel mounted to rotate, on the support, about a closing wheel pivot of axis F, so as to close, at least partially, the furrow in which the compound has been deposited, the opening disc, the seed dropper and the closing wheel being successively mounted, from the front towards the rear, on the support, the support having the opening disc, the seed dropper and the closing wheel being successively mounted, from the front towards the rear, on the support, the support having - a base for fastening to the agricultural vehicle, - a share, disposed between the opening disc and the seed dropper, the support having a rocker mounted to rotate on the base about a rocker pivot of axis B, the rocker bearing respectively the opening disc pivot and closing wheel pivot, such that, in the service position, if the opening disc or the closing wheel lifts, the reaction of the ground on the closing wheel or the opening disc, respectively, tends to return the opening disc or the closing wheel, respectively, towards the ground, the axes O, F and B extending in respective transverse planes perpendicular to the direction of forward travel of the seeder, the transverse plane P in which the axis B extends separating the opening disc pivot and the closing wheel pivot, the seeder being characterized in that the seed dropper and/or the share is/are fastened rigidly to the base.