| 摘要 |
PROBLEM TO BE SOLVED: To positively develop air-flow separation at the rear end of a rear bumper and smoothly flow an air flow toward the rear of a vehicle while suppressing the occurence of a turbulent flow to reduce air resistance during travelling. ! SOLUTION: A rear bumper 3 is provide with a first plane part 31 arranged at a vehicle lower end and a second plane part 32 arranged continuously in the rear end of the first plane part 31 and having an angle b different from of an angle a of the first plane part 31. The first plane part 31 has a length of 80 mm or more from the vehicle rear end in vehicle longitudinal directions. The first plane part 31 is arranged longer than the second plane part 32 in the vehicle longitudinal directions. A shape of the lower end part of the rear bumper 3 in the vehicle longitudinal directions is formed under the setting condition that the first plane part 31 and the second plane part 32 have different angles to a road surface G: the angle a of the first plane part 31 to |
