Abstract: Vehicle body of a two-wheeled vehicle assembled by holding a plurality of center members on a center jig which may be movable between a setting station and a coupling station, setting side frame members on a pair of side frame jigs in a prostrate posture at a position laterally adjacent the coupling station with the side frame jigs being a jig frame formed of frame materials with spaces therebetween, welding the side frame members together by welding robots adjacent the coupling station, erecting the side jigs to position the welded side frames in position with respect to the center members on the center jig, and welding the side frames to the center members using the same welding robots extending through the spaces in the jig frame of the side frame jigs.