A hand grip has an arm and a leg. The arm and the leg extend through a door outer panel and are supported by a holder member and a frame member in a freely pivotable manner, respectively. By operating the hand grip in the same direction as when a sliding door is opened, the arm is pivoted relative to the holder member retained at an initial position, so that a full close latch mechanism is unlocked. By operating the hand grip in the same direction as when the sliding door is closed, the leg is pivoted relative to the frame member, while the holder member is pivoted relative to the frame member against urging force of a coil spring, so that a full open latch mechanism is unlocked.