A longitudinally adjustable vehicle seat comprises a seat frame, a backrest pivotally mounted on the seat frame and foldable down in the direction of a seat surface of the seat frame, a longitudinal rail guide having a guide rail pair 2 including a lower guide rail 21 and an upper guide rail 22, a seat adjuster mechanism including a releasable locking device 3 for locking and unlocking the position of the upper guide rail 22 relative to the lower guide rail 21 in a design position P between an internal full rear limit stop and a comfort full forward limit stop 62 defining a functional comfort adjustment range D, an easy-entry mechanism for displacing the vehicle seat to an extended travel full forward position C upon folding down the backrest onto the seat surface, and a pivotable over-travel and limit stop bracket 5 which is adapted to rotate to bypass the comfort full forward limit stop 62 upon activation of the easy-entry mechanism for entering an extended travel range.

A seat sliding device includes a lever member, a lock member, a rear biasing member, an operation member, and a front biasing member. A cylindrical portion of the operation member is inserted inside the lever member. At a front end of the front biasing member inserted into the cylindrical portion of the operation member, a retaining portion and a release portion are formed, the retaining portion preventing the operation member from moving forward, and the release portion extending forward from the retaining portion. A through-hole that penetrates into an interior of the cylindrical portion of the operation member is formed in an upper surface or a lower surface of a part that is forward of a part inserted into the lever member, of the cylindrical portion of the operation member at a position facing the release portion or at a position on a front side from the release portion.