Opening Hours & Library Holidays

Sundays, National holidays, the year-end and New Year's holidays and the third Wednesday of the month (for refiling).

Additionally, the Library could be closed without prior notice in case of natural disasters or other public emergencies. Announcements are posted on the National Diet Library website .

• *To use the Rare Books and Old Materials Room on service Saturdays, it is necessary to make a reservation.

• April 2025

  Library Holiday

  6th, 13th, 16th, 20th, 27th, 29th

  Sun	Mon	Tue	Wed	Thu	Fri	Sat
  		1	2	3	4	5
  6	7	8	9	10	11	12
  13	14	15	16	17	18	19
  20	21	22	23	24	25	26
  27	28	29	30

• May 2025

  Library Holiday

  3rd, 4th, 5th, 6th, 11th, 18th, 21st, 25th

  Sun	Mon	Tue	Wed	Thu	Fri	Sat
  				1	2	3
  4	5	6	7	8	9	10
  11	12	13	14	15	16	17
  18	19	20	21	22	23	24
  25	26	27	28	29	30	31

For the yearly schedule of Library closure, please see the Library Calendar.

Regular library hours are as follows.

Additionally, the National Diet Library is sometimes forced to change its library hours temporarily due to weather impacts on traffic conditions. Announcements are posted on the National Diet Library website.

*Some special materials rooms have different service hours. For more information, please see the guide, "Special Materials Rooms and Reading Rooms."