NOVELTY - A film contains polyvinyl acetal, and 12 parts mass or less plasticizer with respect to 100 parts mass polyvinyl acetal, and has average polymerization degree of 200-2000, acetalization degree of 50-85 mol%, and 0.1-20 mol% vinyl ester monomeric unit. The peak molecular weight of film measured using differential refractive index detector and light absorption luminous intensity detector satisfies specific relations (I) and (II).    USE - Film is used as intermediate film for laminated glass, and sealing material for solar cell module for solar cell (all claimed). Uses include but are not limited to partition glass components, window, wall, roof, sun parlor, sound insulating wall, show window, balcony, and handrail, component of domestic electrical appliance, photovoltaic power plant, etc.    ADVANTAGE - The film provides solar cell having excellent durability, low moisture permeability even when used for long period of time and less coloration due to heating.    DETAILED DESCRIPTION - A film contains polyvinyl acetal, and 12 parts mass or less plasticizer with respect to 100 parts mass polyvinyl acetal, and has average polymerization degree of 200-2000, acetalization degree of 50-85 mol%, and 0.1-20 mol% vinyl ester monomeric unit. The film satisfies the relations: (A-B)/A less than 0.80 (I) and 1x 10-2 less than (b/y)/(a/x) less than 2x 10-1 (II), where A is peak molecular weight of film measured by differential refractive index detector at 230 degrees C for 3 hours using gel permeation chromatography measurement, B is peak molecular weight of film measured by light absorption luminous intensity detector (measurement wavelength 280 nm) measured at 230 degrees C for 3 hours using gel permeation chromatography measurement, a is signal intensity in peak top molecular weight (A), b is signal intensity in peak top molecular weight (B), x is signal intensity in peak top molecular weight measured with differential refractive index detector, when gel permeation chromatography measurement of monodispersed polymethyl methacrylate is carried out, and y is signal intensity in peak top molecular weight measured with light absorption luminous intensity detector (measurement wavelength 220 nm), when gel permeation chromatography measurement of monodispersed polymethyl methacrylate is carried out. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of film, which involves acetalizing polyvinyl acetal and vinyl ester monomeric unit of polyvinyl acetal, and melt-molding the resin composition containing polyvinyl acetal;    (2) intermediate film, which consists of the film;    (3) laminated glass, which is formed by attaching glass plate using the intermediate film;    (4) sealing material, which consists of the film; and    (5) solar cell module, which has sealing material.