A functional molecular element with a reduced contact resistance between the constituting molecule and the electrode, a method for production thereof, and a functional molecular device are provided herein. The method consists of the following steps. A closely adhering molecular monolayer is formed on the surface of the electrodes from a .pi.-electron conjugated molecule (one species of linear tetrapyrrole) composed of the porphyrin-like nearly discoid skeleton and the flexible side chains (alkyl chains). A .pi.-electron conjugated molecule of the same species as the one or different species from the one is piled on the monolayer by .pi.-.pi. stacking to form the array structure. As the result of the foregoing steps, the .pi.-electron conjugated molecule constituting the first molecular layer of the array structure takes on such a configuration that the flexible side chains adsorb to the surface of the electrode and the discoid skeleton orients parallel to and adheres to the surface of the electrode. The second and subsequent molecular layers constituting the array structure have their piling direction controlled by the .pi.-.pi. mutual action.