【Official】Seiwa Kogen no Yado

【Important】Notice regarding national travel support

The nationwide travel support project "Kumamoto Rediscovery Trip (National Version)" is until June 30th.
Reservations are currently being accepted through the observatory's Official website, but there are only a few subsidies left, so if you would like to participate in this project, please make your reservations as soon as possible.It will end as soon as the budget runs out.
・For details of this project, please check the Official website Kumamoto Rediscovery Trip National Version.
・Contact: Seiwa Kogen Observatory ☎0967-82-3300 from 14:00(Closed on Tuesdays)

【important】For guests using plan

  • Information at check-in

    We are taking the following measures to prevent the spread of new coronavirus infection.
    Please understand to all users.
    1. Last reception Please check in by 17:30.
    2. Supper time ends from 17:30 to 19:30
             *We will inform you of the start time between 17:30 and 18:30.
             *We will specify the start time on days when congestion is expected.
             *We will respond in accordance with the standards of the Kumamoto Prefecture Infection Prevention Measures Certification System.
    3. Astronomical Observation Session Capacity/approximately 20 people   
             *Please contact us for times.

Request regarding entry into the premises outside business hours

  • Please leave when closing (22:00)

    Thank you for visiting the Seiwa Plateau Astronomical Observatory.
    The property is open from 14:00 to 22:00 and is not allowed to enter the premises outside business hours.(Excluding guests)
    Regardless of whether or not you participate in the astronomical observation society, we ask for your cooperation in exiting after the business hours are over.
     Those who wish to use the facility after 22:00 for the purpose of astrophotography, etc. need to apply for a license.Please contact the observatory in advance.


  • December 2023

    ◆Astronomical observation party
    For the time being, the following operations will be carried out to prevent the spread of the new coronavirus infection.
    ・Reservation only:Approximately 20 people per session(Including guests)
    ・If you do not have a reservation, you may not be able to observe, so please be sure to contact us.
    ・Observation time: ``Duration: 40 to 50 minutes'' from 19:00.
     On days when there are many users, such as weekends, we will split the information into multiple sessions.
    The observation time may change depending on the weather conditions on the day.

【Official】We provide the latest information on Facebook

Facility information

  • Seiwa Plateau Astronomical Observatory

    Aso Seiwa Plateau Astronomical Observatory is located on the south outer ring of Aso and is located in Minamoto-machi Inaokahara (commonly known as Seiwa Plateau), with an altitude of 700 m and a good 360-degree view.
    You can enjoy Mt Aso the north side and the 1000 m class Kyushu Mountains on the south side, and enjoy the best location.
    There are few city lights and the air is clear, so you can enjoy a lot of starry sky.

    ・east longitude:131.06
    ・north latitude:32.44
  • Seiwa Kogen no Yado

    This lodge type accommodation is located on the west side of Seiwa Plateau Astronomical Observatory.(A total of 10 buildings)
    Why don't you stay overnight at Seiwa Kogen no Yado and play with the stars all night long?

    An accommodation plan with dinner and astronomical observation is also available.
  • Restaurant"Seiza no Mori (woods)"

    At restaurant Seiza no Mori (woods), super-sized yakiniku is a standard menu.
    It is served as dinner for in-house guests.

    Snacks and coffee are also available.
    Please drop in when you come to Seiwa Plateau.
To facility information page


Google Map

Hotel Name

Seiwa Kogen no Yado


1238-14 Imuta, Yamato Town, Kamimashiki County, Kumamoto Prefecture

Telephone number



60 minutes from the expressway (Oike Takayama IC, Matsubase IC) towards Takachiho, 40 minutes from Minamiaso Village, 15 minutes from Roadside Station Seiwa Bunraku Mura
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Reservations and Inquiries

Please contact us if you have any questions.