In the title compound, C(22)H(22)O(3), the dihedral angle between the naphthalene ring system and the benzene ring is 79.95 (5)°. The bridging carbonyl C-C(=O)-C group makes dihedral angles of 24.21 (7) and 82.43 (8)°, respectively, with the naphthalene ring system and the benzene ring. In the crystal, weak inter-molecular C-H⋯O inter-actions link mol-ecules into chains parallel to the c axis.