VEHICLE LOWER MEMBER

To provide a vehicle lower member which can achieve improvement of fatigue strength of the member without causing mass increase of the member.SOLUTION: A lower member A10 includes: a main member 10 having a base part 11; and a reinforcement member 20 having an outer surface 22 oriented to the opposite side of an inner surface 21 in a predetermined direction X and joined to the main member 10. The base part 11 is connected to an input part, on which external force acts, and an attachment part which is attached to a vehicle body. The outer surface 22 includes: a first edge 22A extending from the side where the attachment part is located to the input part; and a second edge 22B which is connected to the first edge 22A and recessed in a direction away from the attachment part when viewed along the predetermined direction X. In the predetermined direction X, at least a part of the second edge 22B is spaced apart from a virtual plane VS which includes the first edge 22A and is arranged in a manner that an in-plane direction is set to a direction orthogonal to the predetermined direction X.SELECTED DRAWING: Figure 6 【課題】 部材の質量増加を招くことなく、当該部材の疲労強度の向上を図ることが可能な車両下部部材を提供する。【解決手段】 下部部材Ａ１０は、基部１１を有する主部材１０と、所定方向Ｘにおいて内面２１とは反対側を向く外面２２を有するとともに、主部材１０に接合された補強部材２０とを備える。基部１１は、外力が作用する入力部と、車体に取り付けられる取付け部とにつながっている。外面２２は、前記取付け部が位置する側から前記入力部に向かって延びる第１縁２２Ａと、第１縁２２Ａにつながり、かつ所定方向Ｘに沿って視て前記取付け部から遠ざかる向きに凹む第２縁２２Ｂとを含む。所定方向Ｘにおいて、第２縁２２Ｂの少なくとも一部が、第１縁２２Ａを含み、かつ所定方向Ｘに対して直交する方向を面内方向とする仮想平面ＶＳから離れて位置する。【選択図】 図６