Patent ID: 8033520

Claim:
A vehicle seat slide mechanism that is capable of sliding a vehicle seat with respect to a floor, comprising: an upper rail attached to the vehicle seat and extending in a sliding direction of the vehicle seat; and a lower rail capable of being attached to the floor as a guide member slidably guiding the upper rail and extending in a sliding direction of the upper rail, wherein the upper rail has engagement surface portions each having a projected surface portion that is projected in a direction different from the sliding direction thereof, the engagement surface portions being positioned at two portions that are spaced from each other in the sliding direction of the upper rail, wherein the lower rail has a detent surface portion having a projected surface portion that is projected upwardly with respect to the sliding direction of the upper rail, wherein the detent surface portion is positioned between the engagement surface portions formed in the upper rail, so as to be covered with the upper rail, wherein when one of the engagement surface portions contacts the detent surface portion due to sliding of the upper rail, the vehicle seat can be prevented from sliding, and wherein the engagement surface portions provided to the upper rail are respectively formed so as to be projected from lower end portions of right and left side surface portions that continuously extend vertically downwardly from both sides of a flat plate-shaped upper surface portion of the upper rail.