Constitution Memorial Day.

The date commemorates Japan's post-war constitution and sits inside a broader spring sequence that reshapes domestic movement, leisure, and business closures each year.

That combination of constitutional symbolism and Golden Week timing makes it more consequential than a standard one-day civic observance.

Constitution Memorial Day is marked as a nationwide observance in the current Japan holiday data.

Constitution Memorial Day works as more than a date check in Japan; it is a public marker that affects staffing, support coverage, school calendars, and travel timing. The next tracked occurrence is May 4, 2026, so this page acts as a quick planning note as well as a historical explainer.

Constitution Memorial Day also appears in other country calendars such as Japan. The next recorded dates across that wider footprint include Japan on May 4, 2026, which helps explain why airline schedules, payroll calendars, and global customer-support shifts often treat the holiday as a regional wave rather than a single-country event.

Japan plans this holiday primarily around Asia/Tokyo. Constitution Memorial Day also tends to be planned alongside New Year's Day, Children's Day, and Greenery Day, because people rarely make calendar decisions about one public holiday in isolation.