Abstract: In a transporting vehicle provided with a trailer hauled by a tractor, the trailer is constructed by a first trailer unit connectable with the tractor and a second trailer unit detachably connectable with the first trailer unit. At mutually opposed connecting sections of the first and second trailer units is provided a connecting mechanism for integrally connecting the first and second trailer units with the rear end of the first trailer unit held in contact with the front end of the second trailer unit. The transporting vehicle can transport cargoes on roads other than main roads while being allowed to have a relatively simple construction and an improved loading capacity.