Automatic vehicle assembly

In apparatus for assembling exterior parts of a motorcar onto a body, assembling accuracy errors of the body are determined by measuring positions of a plurality of reference points of said motorcar body, correction data is calculated which updates assembling positions of the exterior parts which form the external shape of the motorcar which maintains the relative positions of the parts, to eliminate misalignment among the parts due to the assembling accuracy errors of the motorcar body. Each of the parts is then assembled by respective assembling robots to a respective assembling position which has been corrected in accordance with the calculated correction data. The assembling apparatus is described in detail.