A photoelectric conversion element having an electrically conductive support, a photoconductor layer including an electrolyte, a charge transfer layer including an electrolyte, and a counter electrode, in which the photoconductor layer has semiconductor fine particles carrying a metal complex dye represented by the following Formula (1), and a dye-sensitized solar cell; and a metal complex dye, a dye solution, and a terpyridine compound, or an esterified product thereof, each of which is used in the photoelectric conversion element and the dye-sensitized solar cell, ML1L2(X)n1.CImY  Formula (1) in Formula (1), M represents a metal ion, L1 represents a tridentate ligand having a group L represented by the following Formula (LV-1) or (LV-2); L2 represents a bidentate or tridentate ligand which coordinates to M with an anion, in which a ring including a ring-constituting nitrogen atom which coordinates to M with an lone electron pair has an organic group RVL: -(RVL)nVL; X represents a monodentate ligand; n1 represents 0 or 1; CI represents a required counterion; and mY represents an integer of 0 to 3, -RV1=RV2-RV3   Formula (LV-1) —C≡C—RV3   Formula (LV-2) in the formulae, RV1 and RV2 each independently represent a nitrogen atom or CRV4, RV4 represents a hydrogen atom or a substituent, and RV3 represents an aryl group or a heteroaryl group; RVL represents a specific aromatic ring group or the like; and nVL represents an integer of 0 or more.