The molecular motion of self-assembled monolayers (SAMs) on gold was examined using surface plasmon resonance (SPR) under an electric field. Electrically stimulated SAMs are generated from asymmetric disulfides containing a cyano-fluoro-terphenyl moiety that has a large anisotropic factor of the dipole moment. SPR was combined with a liquid crystal (LC) cell, which only detects a strong influence of the electric field on SAMs. A slight change in the SPR angle was observed upon the application of an electric field in the cell. The response time to saturation of the change of the.,SPR resonance angle is approximately 150 ins, which is not as fast as those of conventional liquid crystal materials. Furthermore, the relaxation time is much slower than in the case of a conventional liquid crystal cell. This is the first demonstration of an electrically induced motional behavior of a SAM that is chemically attached to a gold surface.