NOVELTY - The apparatus (10) has a conveying unit that conveys a base material in a film-forming chamber (11). An evacuation unit (40) makes a preset pressure inside film-forming chamber. The film formation chambers (14,16,18) are provided in film-forming chamber. The film formation chamber has a cooling wall (38) through which temperature is controlled to 180 degrees C or more and a heating wall (36) through which temperature is controlled to 80 degrees C or less. A vacuum coating unit (30) of film-formation chamber forms a photoelectric converting layer in conveyed base material.    USE - Film-forming apparatus of solar cell (claimed).    ADVANTAGE - Since the usage-amount of selenium (Se) is reduced when the photoelectric converting layer contains selenium, the cost can be reduced while carrying out yield improvement. The effect of reduction of the usage-amount of Se is large and the effect of a cost reduction is also large when forming a photoelectric converting layer in the base material using a roll-toroll system. As the adhesion of Se inside the film-forming chamber is suppressed, the deterioration of mechanism elements such as the exhausting unit of the conveying unit, the vacuum coating means, and the vacuum pump can be suppressed, so that the operation which eliminates Se adhering in the film-forming chamber can be reduced, the frequency of a maintenance can be reduced, and the maintainability of the film-forming chamber can be improved. Since the adherence of the Se to the base-material back surface can be suppressed when the film is formed, the generation of film defects such as peeling of a film can be suppressed. Since adhesion of Se on the back surface of a base material is suppressed when winding up the base material, the damage of the photoelectric converting layer can be suppressed.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the film-forming apparatus.    Film-forming apparatus (10)    Film-forming chamber (11)    Film-formation chambers (14,16,18)    Vacuum coating unit (30)    Heating wall (36)    Cooling wall (38)    Evacuation unit (40)