To provide a method for producing a chlorinated hydrocarbon compound, such as 1,4-bis(2-chloro-2-propyl)benzene, useful as a cation polymerization initiator, comprising chlorinating with a hypochlorous acid compound, whereby the chlorinated hydrocarbon compound can industrially stably be produced in a high reaction yield and in high selectivity.

This method for producing the chlorinated hydrocarbon compound, comprising adding a protonic acid to a mixture of a specific hydrocarbon compound with an aqueous metal hypochlorite solution, is characterized by adding a phase transfer catalyst.