To obtain both durability and conversion efficiency of a solar cell element by adopting a transparent electrode which is easily manufactured at a lower price than prices of existing transparent electrodes.

The organic solar cell includes a photoelectric conversion layer between at least one pair of electrodes. At least one of the pair of electrodes is a transparent electrode containing a transparent conductive polymer. The transparent electrode contains a water-soluble binder having a structural unit represented by the following general formula (I).