Celebrated on 29 Apr. The birthday of former Emperor Showa ( Emperor Hirohito ). Before 2007, April 29 was known as Greenery Day (now celebrated on May 4). Showa Day is part of the Golden Week. Today is a national holiday.

Originally the Showa Emperor's birthday, it was decided after his death to maintain the holiday, but in a different form, as it had become the traditional beginning of the Golden Week holidays. Since the Showa Emperor loved plants and even published books on plants and marine animals, the government decided to name the day Greenery Day.