Abstract: Provided is an optical device and the like which can suppress a decrease in optical performance even under high-temperature heating environments, such as a ref low process. Since at least one of compound lenses 10 and 110 made of heat-resistant resin includes an antireflection structure 51 as a fine asperity structure layer on an inside surface facing a space, even if a subsequent heat treatment is performed, a decrease in optical performance of the lens due to wrinkling can be prevented unlike a case in which an antireflection film is provided. The antireflection structure 51 is covered, for example, by a thin protective layer 52.