To provide a body of rolling stock capable of heightening the strength of the car and its reliability, shortening the time for manufacturing the car, allowing a robot to take several stages of manufacturing process, and establishing easy adaption of the car appearance to the requirements placed.

The body of rolling stock is embodied in a complex structure consisting of a frame assembly 1 made of aluminum or aluminum alloy, a roof assembly 2 made of aluminum of aluminum alloy, and two mounting surface assemblies 3 of a composite material which are fixed to the frame assembly 1 and roof assembly 2, respectively.