Conjugated polymer composition and a photoelectric conversion device using the same

Can form an ideal phase-separated structure with respect to the photoelectric conversion element, solubility in solvent is high, provides a good organic thin film can be formed conjugated polymer composition. Conjugated polymer composition comprises a divalent heterocyclic group consisting of condensed π-conjugated skeleton in the main chain, and having a fluorine atom or a side chain is optionally substituted alkyl or alkoxy group with a hydroxyl group, polystyrene and a number average molecular weight converted is a conjugated polymer composition containing at least two conjugated polymer is at least 10000 g / mol, in solubility parameter of each of the conjugated polymer, a conjugated polymer and the minimum value with a maximum the difference between the conjugated polymer having is of 0.6 to 2.0.