| 摘要 |
PROBLEM TO BE SOLVED: To obtain a vehicle body frame which improves the productivity while securing the strength.SOLUTION: A vehicle body frame of a motor cycle includes: a head pipe portion 2 which supports a steering shaft; a main frame portion 3 extending from the head pipe portion 2 to the vehicle body rear side; and a down frame portion 5 which extends from the head pipe portion 2 to the vehicle body lower side. The down frame portion 5 includes: a front down frame member 70 forming at least a front part and a rear down frame member 80 forming at least a part of a rear part and is formed by joining the front down frame member 70 to the rear down frame member 80. An arm part 85, which supports the main frame portion 3, and a gusset part 83, which reinforces a joint part of the main frame portion 3 joined to the head pipe portion 2, are integrally formed at the rear down frame member 80. |
