A photoelectric conversion element having an electroconductive support, a photosensitive layer containing an electrolyte, a charge transfer layer containing an electrolyte, and a counter electrode, the photosensitive layer having semiconductor micro-particles carrying a ruthenium complex dye represented by formula (1); a dye-sensitized solar cell in which said photoelectric conversion element is used; a ruthenium complex dye represented by formula (1); a dye solution containing said ruthenium complex dye; and a bipyridine compound that is suitable as a ligand of said ruthenium complex dye. R1-R10 are hydrogen atoms or specific groups. n1 and n2 are 0 or 1, A1 and A2 represent acidic groups, and Z1 and Z2 represent monodentate ligands.
