PURPOSE:To obtain a synthetic resin film suitable for aging fruits, providing the same effects as those obtained by irradiation with mild far infrared rays, containing an inorganic substance emitting far infrared rays with specific wavelength. CONSTITUTION:A synthetic resin (e.g. polyethylene, polypropylene, etc.) is blended with 1-60wt% inorganic substance (e.g. alumina, kaolinite, etc.) emitting far infrared rays with 1-1,000mum, preferably 2-800mum wavelength and molded into a film.