The present invention provides an organic device comprising a substrate having a polymerized monomolecular or built-up multi-monomolecular film, a first electrode, a second electrode with said film intervening between the electrodes, a third electrode connected directly or indirectly to the monomolecular or built-up multi-monomolecular film, which device is operated by applying a voltage between the third electrode and the second electrode to control an electric current flowing between the first electrode and the second electrode through said polymerized monomolecular or built-up multi-monomolecular film between the electrodes. If the polymerization of the monomolecular film is eliminated, the device can be imparted with learning functions because the polymerization of the film proceeds depending upon an amount of electricity flowing during the use of the device. Since the present invention makes use of electroconductive groups in the monomolecular or built-up multi-monomolecular film, there can be produced such devices with organic materials as being independent of crystallinity even when any fine processing is performed for further increasing the high packing density of the devices.