A fullerene derivative having a partial structure represented by formula (1):wherein R represents a monovalent group, and r represents an integer of 0 to 4,in particular, a fullerene derivative, which has one to four structures represented by formula (1), can be applied to an organic photoelectric conversion element having a high open-circuit voltage and is therefore suitable for an organic thin-film solar cell or an organic photosensor, and thus it is extremely useful.
