NOVELTY - The bifacial solar cell module has many bifacial solar cells (10) in which upper and lower light transmitting substrates (30,40) are positioned at the upper and lower sides of solar cells respectively. A sealing element containing a layer made of sealing material (51,53) is positioned between upper and lower substrates. The light transmittance and absorptance of ETFE made upper substrate or iron glass made lower substrate is 5% or less in an entire wavelength band.    USE - Bifacial solar cell module for photovoltaic power generation system installed in house.    ADVANTAGE - The light transmitting substrate is made of ETFE3 which produces 85% or more transmittance and 1% or less absorptance, so that efficiency of bifacial solar cell module is increased. The surface processor layer with a sealing material can be a primer for reinforcing adhesive strength with seal material, so that moisture penetration is prevented. The substrate made of ETFE is used to absorb light of UV ray band of 300-500 nm, so that damage due UV rays is avoided. The substrate made of ETFE is set with tensile strength of 40 MPa or more and elongation ratio of 250% or more, so that excellent mechanical strength is provided. The substrate made of ETFE can be manufactured in a thickness of 50 mm or less, so that excellent conductivity is achieved. The ETFE made substrate is set with a refractive index similar to silicone resin used as sealing material, so that excellent light transmittance is achieved. Since silicone resin can be formed in thickness lesser than ethylene vinylacetate used as sealing material, the thickness of the module can be decreased. The fiber material is positioned inside the sealing material, so that the strength of solar module is increased, and the generation of crack and distortion of silicone resin can be prevented. The silicon resin is set with low curing temperature, so that modularization process can be performed at lower temperature, and curing time can be shortened.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the bifacial solar cell.    Bifacial solar cell (10)    Interconnection (20)    Light transmitting substances (30,40)    Sealing materials (51,53)    Interface between sealing materials (S)