an elevator including a movable unit configured to ascend and descend in an elevator shaft , a guide rail installed on the elevator shaft via a plurality of rail support members and configured to guide the movable unit , a cable configured to hang the movable unit , and a driving unit mounted on the guide rail and configured to move the movable unit up and down by driving the cable . at least two securing members fixes one of the rail support members is fixed to a wall of the shaft by securing members separated from each other by an interval in the vertical direction .