An anodic photocurrent due to photoinduced electron transfer between excited Ru(bpy)(3)(2+) and triethanolamine was remarkably enhanced by light irradiation using the surface plasmon resonance on a silver electrode which was modified by amphiphilic copolymer Langmuir-Blodgett monolayer containing Ru(bpy)(3)(2+) compared with irradiation of transmitted light.