An electric element comprising a π-conjugated system macromolecule having a property that its conductivity is varied by the excitation due to the polarization of a dielectric and a ferroelectric provided near the macromolecule. The electric element has a function of controlling the conductivity of the π-conjugated system macromolecule by applying an electric field to the ferroelectric substance. The electric element is used as a relay element, storage element, switching element or the like.