A photoelectric conversion device includes a quantum dot layer formed by integrating a plurality of quantum dots on a main surface of a semiconductor substrate. The quantum dot layer contains not less than two types of organic molecules having different carbon numbers, among the quantum dots. The quantum dots are bonded to one another by lower-carbon-number organic molecules having a lower carbon number to form aggregates of the quantum dots. Higher-carbon-number organic molecules having a higher carbon number are bonded to the outer sides of the aggregates.