Provided are a photo-electrode for dye-sensitized solar cells, and back contact dye-sensitized solar cells comprising the same. The photo-electrode includes a porous membrane having metal oxide nano-particles adsorbed in a photosensitive dye directly contacting a transparent substrate without intermediation of a conductive film, so that the photo-electrode has advanced light transmittance without absorption and scattering of incident light by the conductive film and application possibilities to a thin film retaining a high-level of electrical conductivity, as well as an easy forming method for the conductive film.