A photovoltaic module having long-term durability is obtained at low cost.A CIS based thin-film photovoltaic module 1 is obtained by bonding a cover glass 4 comprising, e.g., a semi-tempered white flat glass, which is inexpensive and durable, to a CIS based thin-film photovoltaic circuit 2 on a glass substrate 2A with a thermally crosslinked ethylene vinyl acetate (hereinafter referred to as EVA) resin film 3 (or sheet) as an adhesive. Use of the EVA resin film 3 reduces the amount of an EVA resin to be used. In the crosslinking, a gas generating from the EVA resin film is removed by vacuum suction to prevent bubble generation or inclusion, etc. A high-capacity storage capacitor 9 is disposed on that side of the glass substrate which is opposite to the circuit side to store the electricity optically generated by the circuit.