Abstract: The present invention relates to a vehicle composite test apparatus wherein various test items of a vehicle are carried out with the tires placed or fixed on support bases being means to be detected, particularly provides a vehicle composite test apparatus wherein the vehicle center line Lc and the measurement reference line Ls can easily and automatically aligned, and in order to enhance further the effects of the above invention, the present invention also provides a parallel moving mechanism constituted such that a pair of moving platforms for allowing a vehicle to be advanced can smoothly be moved in parallel with precision, a tire guide apparatus for guiding tires precisely to tire setting positions of said test apparatus, and a lock mechanism capable of effecting easily and positively the lock operation of a pair of active juxtaposed rollers arranged at said tire setting positions.