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 and R2 are each the same as defined in general formula (3)] to the Diels-Alder reaction with cyclopentadiene and/or dicyclopentadiene in the presence of a solvent to provide a reactional mixture. The resultant reactional mixture is separated into two or more layers and at least a part of a cyclopentadiene polymer such as a trimer or a tetramer of the cyclopentadiene is dissolved in one or more layers thereof. At least a part of the condensed ring-containing compound represented by general formula (3) having the dimethanonaphthalene skeleton, etc., is dissolved in other layers to carry out liquid separating operation to purify the compound represented by general formula (3).