| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive back door whose rigidity is enhanced while suppressing its weight from increasing.SOLUTION: On an inner lower half part 19 of an inner member 5, a recessed line shape groove part 51 opened toward an outer lower member 13 side of an outer member 7 is formed along an outer peripheral edge part. To the recessed line shape groove part 51, a belt-like reinforcement member 53 which is thin and can deform easily toward a thickness direction is fitted in a state that a side surface of the belt shape reinforcement member 53 faces a groove side surface of the recessed line shape groove part 51 in a state that bending toward the thickness direction is regulated. |
