1. A space for mounting the opening and closing unit of the
    door when entering and exiting a vehicle
2. External beauty can be enhanced by covering the body
    (the door panel).
3. A space for mounting electronic components
    (including the P/W switch and the B/Mirror switch)
4. Impact from a crash at the side can be absorbed
5. A space for storing articles is made available and
    the convenience of an armrest is also provided.