REINFORCEMENT MEMBER FOR VEHICLE, AND METHOD FOR MANUFACTURING SAME

There is provided a reinforcement member for a vehicle which includes a cylindrical body section having a continuously closed cross section intersecting with a longitudinal direction. The cylindrical body section has a first surface located inside a vehicle when mounted on the vehicle, a second surface separated from and facing the first surface, and a third surface connecting the first surface and the second surface to each other. The third surface has a fourth surface extending away from the second surface, and a fifth surface connecting the fourth surface and the first surface to each other. In a sectional view when viewed in the longitudinal direction, in a case where a virtual line connecting a first intersection portion where the first surface and the third surface intersect with each other and a second intersection portion where the second surface and the third surface intersect with each other is set, a third intersection portion where the fourth surface and the fifth surface intersect with each other protrudes outward with respect to the virtual line. The cylindrical body section has a changing portion where a position of the third intersection portion in a mutually facing direction of the first surface and the second surface is changed along the longitudinal direction.