The present Japanese Constitution was declared on May 3rd, 1947, during the Showa Period. To commemorate this event, May 3rd became a national holiday and is called as Constitution Memorial Day

The anniversary of the Constitution's promulgation is marked with ceremonies around the country. It is the only day of the year that the public can visit the National Diet Building, which is normally closed to the public. Being a day that draws its significance from the Japanese constitution, Constitution Memorial Day is often chosen as a day to reflect upon the meaning of democracy and Japanese government. Many people attend lectures on the role the Constitution has played for over 50 years.