Vehicle seat comprising: - a seating part, - a backrest mounted so as to pivot on the seating part, - a hinge mechanism adapted for adjusting the angular position of the backrest relative to the seating part, the hinge mechanism comprising: - a first frame intended to be fixed to the seating part and a second frame intended to be fixed to the backrest, - a blocking device for maintaining the angular position of the second frame relative to the first frame, the blocking device being movable between a blocking position where the angular position of the second frame relative to the first frame is maintained and a release position where the second frame is movable relative to the first frame, - a guide mechanism comprising: - a track unit comprising a first rail and a second rail both extending in a longitudinal direction and mounted so as to slide relative to one another along the longitudinal direction, and - a locking device mounted so as to be movable between a locking position where the position of the second rail relative to the first rail is locked, and an unlocking position where said locking device allows the second rail to move relative to the first rail, - a single actuation device, adapted to operate selectively in either: - a backrest control mode, acting on the blocking device to cause movement of the blocking device to the release position, - or a track control mode, acting on the locking device to cause movement of the locking device to the unlocking position, the actuation device being controlled by control means operable by a user to cause the actuation device to operate either in backrest control mode or track control mode, characterized in that it further comprises a transmission member actuated by the actuation device, the transmission member being arranged between the actuation device and the blocking device and locking device, the transmission member being adapted for moving the locking device to the unlocking position and the blocking device to the release position, and in that it further comprises a first control member operable by a user to operate the actuation device in backrest control mode and a second control member operable by a user to operate the actuation device in track control mode. - a seating part, - a backrest mounted so as to pivot on the seating part, - a hinge mechanism adapted for adjusting the angular position of the backrest relative to the seating part, the hinge mechanism comprising: - a first frame intended to be fixed to the seating part and a second frame intended to be fixed to the backrest, - a blocking device for maintaining the angular position of the second frame relative to the first frame, the blocking device being movable between a blocking position where the angular position of the second frame relative to the first frame is maintained and a release position where the second frame is movable relative to the first frame, - a first frame intended to be fixed to the seating part and a second frame intended to be fixed to the backrest, - a blocking device for maintaining the angular position of the second frame relative to the first frame, the blocking device being movable between a blocking position where the angular position of the second frame relative to the first frame is maintained and a release position where the second frame is movable relative to the first frame, - a guide mechanism comprising: - a track unit comprising a first rail and a second rail both extending in a longitudinal direction and mounted so as to slide relative to one another along the longitudinal direction, and - a locking device mounted so as to be movable between a locking position where the position of the second rail relative to the first rail is locked, and an unlocking position where said locking device allows the second rail to move relative to the first rail, - a track unit comprising a first rail and a second rail both extending in a longitudinal direction and mounted so as to slide relative to one another along the longitudinal direction, and - a locking device mounted so as to be movable between a locking position where the position of the second rail relative to the first rail is locked, and an unlocking position where said locking device allows the second rail to move relative to the first rail, - a single actuation device, adapted to operate selectively in either: - a backrest control mode, acting on the blocking device to cause movement of the blocking device to the release position, - or a track control mode, acting on the locking device to cause movement of the locking device to the unlocking position, - a backrest control mode, acting on the blocking device to cause movement of the blocking device to the release position, - or a track control mode, acting on the locking device to cause movement of the locking device to the unlocking position,