National Astronomical Observatory of Japan

Information for Visitors (Updated on June 8, 2022)

The following events and facility have now reopened with limited hours on Saturdays and Sundays.
・Solar Observation Parties at the 20-cm Telescope Dome (from 10:30 a.m. to 11:45 a.m., only on sunny days)
・The Observatory History Museum (from 1:00 p.m. to 4:30 p.m.)

The 20-cm Telescope Dome, the Repsold Transit Instrument Building, and the Gautier Meridian Circle Building are currently open to the public. The Exhibition Room, the Astronomical Instruments Museum, and the Resting Room are still closed.

  • If you were in close contact with a suspected or confirmed case of COVID-19, please do not attempt to visit campus.
  • Please make sure to check your temperature before going out. If you have a cough, fever (above 37.5℃ or 99.5℉), or other cold symptoms, please do not attempt to visit campus.
  • Visitors are asked to visit one person or a small group of people at a time.
  • There is no indoor resting space available in the visitors' area.
  • Please leave your contact information and take your temperature at the Gate House.
  • You should always wear a mask during your visit. When removing your mask, please make sure to keep enough distance from others and follow proper cough etiquette.
  • Drinking and eating are not allowed in the visitors’ area except for the purpose of hydration.


Opening hours
The open hour is 10:00 am to 5:00 pm (the admission is until 4:30 pm ).
How to Join
No reservations required. Please sign in at the Guard House.
Saturday / Sunday, national holidays, during summer vacation / spring vacation period
There are Solar Observation Day at 20-cm Telescope Dome.
Solar Observation Day
Free Wi-Fi is available.
Audio Guide
Visitors can access the audio guide to our facilities via their smartphone or tablet pc.
Admission free. There are free bicycle parking and toll parking.
NAOJ Mitaka Campus Guidebook is available in English, Japanese, Chinese, Korean, and Spanish. Ask at the Gate House.

Visitors’ Area

Regular Open Course


Campus Map

Download the campus map (PDF): Color Monochrome

For your safety and smile

  • Please not to enter the areas and facilities that are not opened for public. Be careful mosquitoes, bees, snakes and etc.
  • The National Astronomical Observatory of Japan is a research institute. Please not to come to the open course in the campus with pets. Assistance dogs (service dog, guide dog, and so on) are allowed in the campus.
  • Please use resting room or outdoor bench to eating and drinking. During lunch time, you can use cafeteria of the University of Tokyo CO-OP NAOJ branch.
  • Please take all your garbage back home with you. Thank you for your cooperation.
  • Smoking is prohibited inside the campus except smoking area.
  • National Astronomical Observatory of Japan is working on conservation vegetation. Let's keep the rich nature in the campus.

Mitaka Picture Book House in the Astronomical Observatory Forest

In Mitaka campus, there is the Mitaka Picture Book House in the Astronomical Observatory Forest that is utilized of old lodgment of NAOJ.

Opening hours
10:00 a.m. to 5:00 p.m. (Closed : Tuesday, year-end and New Year holidays.)
Mitaka Picture Book House in the Astronomical Observatory Forest

*There is no English visitor guide page in the site.*