To provide a method for industrially advantageously producing a condensed ring-containing compound having a dimethanonaphthalene skeleton, etc.

This method for producing the condensed ring-containing compound represented by general formula (3) (R1 and R2 denote each hydrogen or a 2-5C acyl group; and n is an integer of 0-2) comprises subjecting a compound represented by general formula (1) R1OCH2CH=CHCH2OR2 (1) [R1 and R2 are each the same as in general formula (3)] and/or a norbornene compound represented by general formula (2) [R1 are each the same as in general formula (3)] to the Diels-Alder reaction with cyclopentadiene and/or dicyclopentadiene to provide a reactional mixture. A purification step thereof includes an extraction step of separating and removing at least a part of a cyclopentadiene polymer such as a trimer or a tetramer of the cyclopentadiene by solvent extraction.