Patent ID: 8469132

Claim:
A vehicle body frame comprising: a first pipe extending along an axial direction and including a curved surface part having an arc-shaped cross section; a second pipe extending along the axial direction and facing the curved surface part along the axial direction, the second pipe including a concave groove and a projecting part offset outward in a width direction with respect to a center line of the first and second pipes; and a welded part arranged to join the curved surface part and the projecting part to each other on each of first and second sides of the first and second pipes in the width direction; wherein a curvature of the concave groove in the second pipe is larger than a curvature of the curved surface part of the first pipe such that a gap is provided between the first pipe and the second pipe along a length of the welded part in order to drain liquids between the first pipe and the second pipe, and between the welded part on the first side of the first and second pipes and the welded part on the second side of the first and second pipes.