To provide a method for continuously producing a halogenated adamantyl derivative by a single-step reaction.

The method for producing the halogenated adamantyl derivative comprises mixing an aromatic compound with an adamantane compound having two or more halogen groups in the presence of a catalyst followed by conducting a Friedel-Crafts alkylation reaction. Specifically, this method involves the following first process: a first solution(A) containing the catalyst and a second solution(B) containing the adamantane compound having two or more halogen groups and the aromatic compound are introduced into a first fine mixing space of 100-2,000μL size as the reaction zone for the adamantane compound and the aromatic compound and continuously mixed together to obtain a third solution containing the halogenated adamantyl derivative.

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