To provide a method for economically producing 6-8C aromatic hydrocarbons such as BTX i.e. benzene, toluene and 8C aromatic hydrocarbons from LCO which is heavy oil.

The method for economically producing 6-8C aromatic hydrocarbons by: contacting a raw materials including LCO with a metal-carrying catalyst in the presence of hydrogen; converting naphthalene or alkylnaphthalene included therein into tetralin or alkyltetralin by hydrogenated one-side nuclear hydrogenation; further contacting tetralin or alkyltetralin with a metal-carrying acid type zeolite catalyst under a certain hydrogenation condition; hydrogenation ring-opening reaction; hydrogenation dealkylation reaction; and transformer alkylation reaction.