Yes, Japan is a developed country. It is considered a 1st world country. Japan has one of the largest and one of the most developed economies in the world.
Japan is highly industrialized. Japan boosts the life expectancy of almost 84 years. It is no surprise that top companies such as Mitsubishi, Toyota, Honda, Panasonic, Toshiba, Nippon, Sharp, and other multinational companies are based in Japan. Japan is also home to many producers of machine tools, ships, processed foods, steel, textile, and chemicals.
Post World War, the general standard of living in Japan has also improved. GNP (Gross National Product) in Japan increased to 564586.40 JPY Billion. The nation also has a GDP per capita of $45,546.