Au nanoparticle (NP) with strong surface plasmon absorption is an attractive alternative to organic photosensitizers in dye-sensitized solar cells with a view to long-term stability. However, Au NPs absorb only a part of visible light, while the energy of the infrared region occupies over 50% of the total solar energy. We have found that the absorption in the infrared region of Au NPs loaded on TiO₂ films drastically increases by forming CdS nanolayers on the Au NPs (Au@CdS/TiO₂). In this study, the photoelectrochemical properties of Au@CdS/TiO₂ were examined to use as a photoelectrode for solar cells. Au NPs were loaded on sol-gel TiO₂ films by a deposition-precipitation method (Au/TiO₂). Further, CdS nanolayers were formed selectively on the Au NPs of Au/TiO₂ by the photodeposition from an ethanol mixed solution of cadmium perchlorate and elemental sulfur. Figure 1 compares the visible light-induced photocurrent response of Au/TiO₂ and Au@CdS/TiO₂. Anodic photocurrents are observed for Au/TiO₂ and Au@CdS/TiO₂, whereas no current flew in the TiO₂ system. Also, the photocurrent of Au@CdS/TiO₂ is much greater than that of Au/TiO₂. This finding may be explained partly in terms of the increase in the absorption strength in the infrared region with the formation of CdS shell layer. The application of Au@CdS/TiO₂ to solar cell is currently under investigation.