Patent ID: 6984455

Claim:
A car body including: an underframe formed of a first hollow member and a side structure formed of a second hollow member, which are welded together at two positions; and the exterior side of said first hollow member, of said underframe, and the exterior side of said second hollow member, of said side structure, are friction stir welded, whereby said underframe and said side structure are friction stir welded to each other at a friction stir welded joint portion, wherein the friction stir welded joint portion exists on a line of an extension of an interior-side surface plate of said first hollow member, and wherein the first hollow member includes a connecting plate having a portion extending perpendicular to the second hollow member and a portion extending perpendicular to a remaining part of the first hollow member, said remaining part being a part of the first hollow member other than the connecting plate, the friction stir welded joint portion being between the second hollow member and the connecting plate.