A solar cell module comprising a solar cell encapsulated through a filler between a surface protective layer and a back face protective layer, characterized in that said surface protective layer is welded to said back face protective layer by way of heat fusion to provide a heat fused portion at at least a side end portion of said solar cell. The solar cell module may be provided with a moisture preventive layer disposed above the solar cell and under the surface protective layer. Further, the solar cell module may be provided with a back face reinforcing member disposed under the back face protective layer. The solar cell module excels particularly in moisture resistance and stably and continuously exhibits a desirable photoelectric conversion efficiency even upon repeated use over a long period of time under severe environmental conditions of high temperature and high humidity.