Polyamides bearing norbornadiene (NBD) unit were prepared by the reaction of either bis(p-nitrophenyl) 2,3-NBD-dicarboxylate or a mixed anhydride bearing at the NBD moiety with various diamines. Films made of the polyamides indicated reversible UV-spectrum changes with UV irradiation, suggesting the occurrence of the photo-valence isomerization between the NBD and quadricyclane units.