Dynamic solution structure of a three-phase interface (oil/water/solid) of a bicontinuous microemulsion (BME) was evaluated electrochemically with apparent diffusion coefficients (D-app's) from cyclic voltammograms With hydrophilic (ITO) and lipophilic (pyrolytic graphite) electrodes, D-app's were much smaller than with an amphiphilic (Au) electrode The D-app ratios of ITO PG-b in the BME were larger than those in a homogeneous aqueous solution These results indicate that BME solution structures around hydrophilic and lipophilic electrodes adopt alternately layered structures but not simple sloped structures