Almost all countries have their own holidays with unique characteristics and personality. Also Japan has its own original holidays. “Coming of Age Day” (Seijin-no Hi) is a Japanese traditional holiday. On this holiday, Japanese people celebrate those who are becoming an adult and they wear Japanese traditional clothes. “Respect for The Aged Day” is a very important day for Japanese people. Especially on this day, Japanese people think about social welfare issues, such as the matter of a falling birth rate and an aging population. “Marin Day” and “Mountain Day” symbolize the start to an amazing summer. In addition, Japanese people connect with nature more on these holidays. Again, each country has its holidays with unique characteristics. Everyone should celebrate each national holiday happily.