Car body of a railway car

The object of the present invention is to enable production of high-accuracy car body with ease. An underframe 10 is constituted by bonding together a plurality of hollow-shaped materials 50, 60 that are arranged along a longitudinal direction of a car body. The hollow-shaped material 60 constituting the end portion of the underframe 10 in the width direction is provided with a hollow-shaped material 65 corresponding to a part of a side sill. A hollow-shaped material 90 at the lower end of a side structure 20 is provided with a hollow-shaped material 95 corresponding to a part of a side sill. An overlap between a projecting segment 101 of the side sill 95 and the upper surface of the side sill 65 is welded from above. An overlap between a projecting segment 103 of the lower end and a projecting segment 73 is welded from below. The size of the overlap is provided in prospect of the shrinkage of the underframe 10 by welding the bolsters thereto.