Disclosed is a p-type organic semiconductive material that is easy to produce and that has a high planarity in its polymer skeleton, and also provides a photoelectric conversion material, a photoelectric conversion layer, a photoelectric conversion element, and an organic thin film solar cell each having high photoelectric conversion efficiency and using the p-type organic semiconductive material. Specifically, the invention provides a bibenzo[b]furan compound having at least one constitutional unit represented by the following formula (1) or (2), as well as a photoelectric conversion material, a photoelectric conversion layer, a photoelectric conversion element, and an organic thin film solar cell each using that compound for a p-type organic semiconductive material. (In the formulae, R13 and R14 each represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an optionally substituted hydrocarbon group, an optionally substituted hydrocarbonoxy group, or an optionally substituted heterocyclic group.)