The present invention provides a cochineal pigment-containing beverage comprising nigerooligosaccharide and an anti-fading method for a cochineal pigment-containing beverage comprising adding thereto nigerooligosaccharide. As the focus evaluation value, high frequency component images are generated from a plurality of images by using a high pass filter, and a standard deviation obtained from a histogram of each of the high frequency component images is used. Without using a solid carbon target, a metal composite diamond-like carbon film is formed on a base material by introducing hydrocarbon gas as a metal target alone is sublimated by arc discharge and ionizing the metal and the hydrocarbon.