Floor Plan
1st Floor
Main Building
Lost & Found
Annex
- Counter
- Annex Copying Center, Annex Printout Counter
- Special Materials Rooms
- Music and Audio-Visual Materials Room
- Others
Coffee shop, 
Accessible restroom, Exhibition Hall (Entrance is Annex 2F)
2nd Floor
Main Building
- Counter
- Main Building Entrance Counter,
General Information Desk, Book Counter,
Main Building Copying Center, Main Building Printout Counter, Microcopy Counter
- Special Materials Rooms・Reading Rooms
- Business, Science and Technology Room, Humanities Room, Reading Room 1
- Others
- National Diet Library Gallery,
Pay phone, 
Accessible restroom (Ostomy-friendly), 
AED, Entrance to Main Building, Lockers
Annex
- Counter
- User Registration Counter, Annex Entrance Counter, General Information Desk, Kansai-kan Material Counter, Periodicals Counter
- Reading Rooms
- Reading Room for Persons with Disabilities, Annex Reading Room, Special Purpose Reading Room (Periodicals)
- Others
- Accessible restroom (Ostomy-friendly), AED, Entrance to Annex, Entrance to Exhibition Hall, Lockers
3rd Floor
Main Building
- Special Materials Rooms・Reading Rooms
- Rare Books and Old Materials Room, Reading Room 2 (The use of electrical equipment is not permitted in this area.), Special Purpose Reading Room (Books)
- Others
- Coffee shop, Pay phone,
ATM
Annex
- Special Materials Rooms・Reading Rooms
- Parliamentary Documents and Official Publications Room
- Others
- Accessible restroom
4th Floor
Main Building
- Special Materials Rooms
- Map Room, Modern Japanese Political History Materials Room
Annex
- Special Materials Rooms
- Newspaper Reading Room
- Others
- Accessible restroom