A photoelectric conversion element module includes a first base material, a second base material, a photoelectric conversion element having a light incident side and sealing portion and arranged between the first and second base materials, an anchoring layer adapted to anchor one of main sides of a light incident side and a side opposite to the light incident side, and one of a main side of the first and second base material opposed to one of the main sides, and a covering section adapted to cover the sealing portion. The Young's modulus of the covering section is 0 MPa or more and 20 MPa or less.