Japanの公的祝日 5月 2026

5月 2026 in Japan runs 31 calendar days, Northern-hemisphere spring and Southern-hemisphere autumn. Japan observes 5 public holidays in 5月 2026: Constitution Memorial Day, Constitution Memorial Day, Greenery Day, Children's Day, Constitution Memorial Day Observed. 4 of those fall on weekdays and reduce the working-day count accordingly. That leaves 17 working days for Japan businesses, payroll cycles, and project schedules in 5月 2026. May centres on May Day / Labour Day, observed in over 80 countries on the 1st, and on Memorial Day in the United States at the end of the month. For broader context, see the full 2026 calendar for Japan or the global view of holidays observed in 5月 2026 across all 190 countries we cover.