NOVELTY - The module (100) has a light-receiving surface side sealing material (201) and a light-receiving surface side protective material (200) formed in a light-receiving surface side of a photovoltaic cell (101). A back surface side sealing material (202) and a back surface side protective material (203) are arranged in a back surface side of the photovoltaic cell. The photovoltaic cell equips a light-receiving surface side of a photoelectric conversion part (50). A backside electrode (8) is formed on a surface of a back surface side of the photoelectric conversion part about 40% or more.    USE - Solar cell module for a water steam transmission amount measurement test device.    ADVANTAGE - The backside electrode is formed on the surface of the back surface side of the photoelectric conversion part about 40% or more, so that long-term moisture resistance can be estimated by changing a material of a sealing material and performance degradation of the module can be prevented, thus improving lifetime of the module, long-term reliability and solar cell characteristic of the module, preventing moisture from an outside of the module and suppressing decline in retention in conditions.    DETAILED DESCRIPTION - The back surface side protective material is made of poly-vinylidene fluoride (PVDF), ethylene and tetra-fluoro-ethylene copolymer (ETFE). The photovoltaic cell is a hetero-junction photovoltaic cell. The module comprises a main component made of material chosen from a polyethylene terephthalate (PET) and polyvinyl fluoride (PVF).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a structure of a solar cell module.'(Drawing includes non-English language text)'    Backside electrode (8)    Photoelectric conversion part (50)    Solar cell module (100)    Photovoltaic cell (101)    Light-receiving surface side protective material (200)    Light-receiving surface side sealing material (201)    Back surface side sealing material (202)    Back surface side protective material (203)