To obtain the subject compound economically in a high yield by making a contact of a chlorinated hydrocarbon with a specific catalyst capable of performing a catalytic dehydrochlorination reaction continuously at a low temperature in a highly active and highly selective method.

This method for producing a lower unsaturated hydrocarbon is to make a contact of a 2-4C chlorinated hydrocarbon with an activated carbon fiber deposited with a tricyclic compound having a ring constituted by C atom and N-atom (suitably pyridine) (hereinafter called N-ACF) for performing a dehydrochlorination reaction. It is preferable to apply the reaction in the case of using 1,2-dichloroethane as the chlorinated hydrocarbon to obtain vinylchloride as an objective material, etc. The above catalytic dehydrochlorination is preferably performed at 350-400°C, under ≥1atm pressure and by continuously supplying the chlorinated hydrocarbon in the state of a gas by heating previously, to the N-ACF. As the N-ACF, e.g. a substance obtained by depositing the above cyclic compound to the activated carbon fiber in a heated state by using Cahn balance device, etc., is cited.