To economically obtain a toluylene diisocyanate by a specific means so as to make a toluylenediamine as intermediate capable of being stored or transported by an ordinary tanker in the form of a mixture with water without any problem of waste disposal stemmed from the tanks of such a tanker.

First, toluene is reacted with nitric acid to form a dinitrotoluene which is then hydrogenated to prepare a crude solution comprising a toluylenediamine (pref. a mixture of 2,4-toluylenediamine and toluylenediamine isomer(s)) and reaction water. Secondly, the crude solution is distilled to form an intermediate mixture 1-40wt.% in water content (pref. with a solidifying point of 65-70°C), which is, in turn, transported from the 1st production plant to 2nd production plant. Subsequently, the above mixture is fully distilled at the 2nd production plant to obtain an anhydrous toluylenediamine which is then phosgenated, thus obtaining the objective toluylene diisocyanate. It is recommended that the distillation of the crude solution is carried out at the atmospheric pressure and that of the intermediate mixture of the 2nd production plant by a vacuum distilling plant.