Dye-sensitized solar cells are expected to be next generation solar cells because of possible low cost production. In order to improve the solar light to electricity conversion efficiency, we examined a tandem type dye-sensitized solar cell. In a tandem cell, the top cell converts shorter wavelength light energy to electricity, and the bottom cell converts longer wavelength light energy. We have developed a new process of preparation of highly transparent nano-structured titanium oxide film electrode for the top cell and multi-layered film electrode for the bottom cell. The conversion efficiency of 11.0 % was demonstrated by using conventional Ru complex dyes as sensitizers. Higher conversion efficiency will be realized when we develop high performance sensitizers optimized for tandem type solar cells.