Provided are a photoelectric conversion element module in which sufficient power generation performance can be obtained, and a method for manufacturing the photoelectric conversion element module. A photoelectric conversion element module obtained by electrically connecting two or more photoelectric conversion elements obtained by stacking a substrate, a first electrode, a photoelectric conversion layer containing a semiconductor and a sensitizing dye, a hole transportation layer having a conductive polymer, and a second electrode in the sequence listed, in which the hole transportation layer is formed by bringing the photoelectric conversion layer into contact with a conductive polymer precursor and then irradiating the sensitizing dye with light in the presence of an oxidizer, whereby the conductive polymer precursor is polymerized.