A thin film solar cell module which comprises a first electrode layer, a semiconductor layer and a second electrode layer, which are deposited on a substrate and at least part of which is worked to partition these layers into a plurality of cells which are electrically connected with each other and sealed with an encapsulant. At least part of at least one of the first electrode layer, the semiconductor layer and the second electrode layer, which is located at the periphery of the substrate, is removed by mechanical means or by means of laser beam. The periphery of the connected solar cells may be surrounded by a high adhesive strength region.