Abstract: A vehicle seat slide mechanism includes a lower rail and an upper rail slidably mounted on the lower rail for movent relative thereto. The lower rail includes a bottom wall, first and second side walls extending in a direction perpendicular to the bottom wall, first and second top walls extending inwardly from respective top edges of the first and second side walls and terminating spaced a distance from each other, and a dependent wall extending towards the bottom wall from the first top wall. On the other hand, the upper rail includes an upright wall lying perpendicular to the lower rail, a bottom wall generally perpendicular to the upright wall and extending widthwise of the upper rail, and an upturned wall extending upwardly from the bottom wall of the upper rail. First and second plurality of balls are accommodated rollingly within opposite spaces on respective sides of the upper rail to facilitate a smooth movement of the upper rail relative to the lower rail.