Abstract: A vehicle body assembly system for feeding various body components to body members conveyed in succession along a body assembly line and assembling together the body components and the body members into vehicle bodies, comprises at least one first component feeding station disposed along the vehicle body assembly line to feed a body component which can be placed by itself on the body member conveyed along the vehicle body assembly line, and at least one second component feeding station disposed along the vehicle body assembly line to feed a body component which cannot be placed on the body member by itself. A first robot is provided along the first component feeding station to accomplish welding into the first component at a sub-assembly table disposed near the first component feeding station and feed the welded first component to the body member.