Events marking Emperor Naruhito's enthronement are expected to cost ¥16.3 billion, up 30 percent from Emperor Emeritus Akihito's accession, due mainly to an increase in the number of guests.

With dignitaries from more than 180 nations and international organizations attending the main ceremony celebrating Tuesday's enthronement — up from the 160 at the previous rite in November 1990 — the accommodation bill will be ¥4.1 billion more, according to the government.

An increase in labor and material costs also pushed up the total.