CastleHilltop castle (hirayamajiro)Japan's 100 Fine Castles No. 16
What makes this castle distinctive
The castle of the Mito Tokugawa, one of the shogun's three senior branch families, defended not by stone walls but by deep moats and earthen ramparts.
Why?
Mito Castle is a hilltop-and-plain castle built of earth at the tip of a long, narrow plateau. Its core covered about 55.7 hectares, roughly 2.6 times that of Wakayama Castle, another Tokugawa senior-branch seat. Mito City says its east-west length of about 1,380 m ranks fourth in Japan after Osaka, Edo and Nagoya, leaving aside mountain castles.[1]
Between the third and second enclosures, a one-minute walk from Kodokan, across the Ote Bridge
What to look at
The two-story wooden gate, 13.34 m tall, and the walls on either side built of alternating layers of tiles and clay
Why it's interesting
This was the castle's main gate. The project began in 2009, when a door said to come from a Mito Castle gate was found at an old temple in Bando City and donated to Mito. After five years of research, the gate was rebuilt with traditional methods and completed in February 2020, partly funded by people who donated the cost of a roof tile as "one-tile lords".[2][5][10]
Can you see it?
Visible from outsideVisible and passable on foot. No vehicles; walk bicycles and motorbikes through.
The second enclosure (ninomaru), reached along the Mitogaku-no-Michi walking route from the Ote-mon gate
What to look at
The white turret (yagura) and wall on the earthen rampart, and the panels and excavated objects displayed inside
Why it's interesting
Rebuilt in wood after the Ote-mon gate, it opened in June 2021. Inside, displays cover the castle's history and the reconstruction work. The turret standing on an earthen rampart helps you imagine how this earth-built castle looked in the Edo period.[3]
Can you see it?
Visible from outsideInterior open, free. 9:30–16:00. Closed December 29 – January 3, in bad weather, and when humidity jams the sliding doors.
03
Kodokan, the domain school
Where
The third enclosure (sannomaru), up the slope from the north exit of Mito Station
What to look at
The main gate, main hall (seicho) and Shizendo, all Important Cultural Properties
Why it's interesting
The ninth lord, Tokugawa Nariaki, opened this domain school in 1841; it was the largest of its kind in Japan. Tokugawa Yoshinobu, the last shogun, studied here as a child. The main gate, main hall and Shizendo survived both the Boshin War and wartime air raids, and became Important Cultural Properties in 1964. It is the place inside the castle grounds to see original Edo-period buildings.[6][7][8]
Can you see it?
Visible from outsideAdmission charged (adults 420 yen). Closed only December 29–31.
At a glance for visitors
Nearest station
10 min walk from JR Mito Station, North Exit
Climb
Some climbing
Time neededEditors' estimate
About 1 hour for the gate, turret and moats; around 2 hours if you also visit Kodokan.
Admission
Adults 420 yen; elementary/junior high students and seniors 70+ 210 yen; groups of 20+ 320 yen (students 160 yen). Free for preschoolers, and for everyone on Ibaraki Prefecture Day (November 13).
Hours
Feb 20 – Sep 30: 9:00–17:00; Oct 1 – Feb 19: 9:00–16:30
Access
Partly open
The Ote-mon gate, Ninomaru corner turret, the Mitogaku-no-Michi route and Kodokan are open to visitors; Kodokan charges admission. Much of the site is school grounds and not freely accessible (visiting conditions for the Yakui-mon gate at Mito First High School are not confirmed).
Mito Castle was built of earth on the tip of a long, narrow plateau about 30 m above sea level. It dates back to the late Heian or early Kamakura period, around the late 12th century, making it one of the oldest castles in Ibaraki Prefecture. In the Edo period, four enclosures (kuruwa), the Shimonomaru, Honmaru, Ninomaru and Sannomaru, lined up from east to west.[1]
02
Historical record
From the Baba and Satake to the Tokugawa
In the Middle Ages the castle passed from the Baba clan to the Edo clan and then the Satake. Satake Yoshinobu rebuilt it extensively around 1593, and in the Edo period Tokugawa Yorifusa, a son of Tokugawa Ieyasu, took over and it became the seat of the Mito Tokugawa family. The Japan Castle Foundation names Baba Sukemoto, Satake Yoshinobu and Tokugawa Yorifusa as its builders.[1][4][10]
03
Historical record
A "three-story turret" instead of a keep
Mito Castle is often said to have had no keep, but the city explains that this is because it was registered with the shogunate as a turret, not a keep; the three-story turret (Sankai Yagura) was a keep in all but name. It looked three stories tall from outside but had five floors inside: an earth-floored ground level, a great hall of 72 tatami mats on the second floor, and just one central pillar, a design found nowhere else.[1]
04
Historical record
The turret lost in an air raid
The turret survived into the 20th century and before the war was counted among Japan's 20 surviving keeps. It burned in the air raid on Mito on August 2, 1945. The same raid destroyed several buildings at Kodokan, including the Hakkedo, the Confucius shrine and the Kashima shrine.[1][7]
05
Historical record
A castle turned school district
Schools now fill the castle grounds; Mito First High School stands on the former main enclosure. Few buildings survive, but the huge dry moats and earthen ramparts still show the power of an earth-built castle with medieval roots. The Yakui-mon gate, said to date from the Satake era, was moved to the high school grounds and is a prefectural Cultural Property. In the third enclosure, Kodokan's main gate, main hall and Shizendo survive from the Edo period.[1][6][7][10]
06
Historical record
Gate and turret rise again
Raising funds through its "one-tile lord" program, the city rebuilt the Ote-mon gate in wood with traditional methods in 2020, and the Ninomaru corner turret and wall in 2021. A walking route, the Mitogaku-no-Michi, has been laid out, and the site is lit up at night. Kodokan was damaged and closed after the 2011 Great East Japan Earthquake, and fully reopened in 2014.[1][2][3][7]
The Ninomaru corner turret and wall are rebuilt in wood and opened[3]
Buildings and remains
The keep today
Keep lost
Officially the castle had no keep, because the shogunate was told it was a turret, but the three-story turret (three roofs outside, five floors inside) served as one. It burned in the 1945 air raid and has not been rebuilt.
The site today
Much of the site is occupied by schools, including Mito First and Third High Schools, which are not freely open. Visits center on Kodokan in the third enclosure and the Mitogaku-no-Michi route linking the Ote-mon gate, the Ninomaru corner turret, and the dry moats and ramparts.
Main buildings
Rebuilt in wood
Ote-mon (main gate)
Rebuilt in wood with traditional methods in 2020; two stories, 13.34 m tall.[2]
Rebuilt in wood
Ninomaru corner turret and wall
Rebuilt in wood and opened in 2021; free exhibits inside.[3]
Original, relocatedIbaraki Prefecture Tangible Cultural Property
Yakui-mon gate
A gate said to date from the Satake era, now standing on the Mito First High School grounds (former main enclosure).[10]
OriginalImportant Cultural Property
Kodokan main gate, main hall and Shizendo
Buildings of the domain school opened in 1841; designated in 1964.[7]
Lost
Sankai Yagura (three-story turret)
The de facto keep; burned in the 1945 air raid.[1]
Key facts
Type
Castle
Setting
Hilltop castle (hirayamajiro)built on a low hill rising from the plainEditorial article
Period
Medieval (c.1185–1570s), Early modern (1570s–1871)Editorial article
Keep (tenshu)
Keep lostthe castle had a keep, but it no longer stands (its stone base may remain)Editorial article
Built by
Satake Yoshinobu, Tokugawa Yorifusa, Daijō SukemotoJapan Castle Foundation
Built
1593Japan Castle Foundation
Main lords
Tokugawa clan, Takeda clan, Satake clan, Baba clan, Edo clan, Daijō clanJapan Castle Foundation
Special Historic Site (former Kodokan) (1952); Important Cultural Properties (Kodokan main gate, main hall and Shizendo) (1964); Prefectural and city cultural properties (Mito Castle ruins)Editorial article
Selection
Japan's 100 Fine Castles No. 16Japan Castle Foundation
Visiting
Access
Partly open
The Ote-mon gate, Ninomaru corner turret, the Mitogaku-no-Michi route and Kodokan are open to visitors; Kodokan charges admission. Much of the site is school grounds and not freely accessible (visiting conditions for the Yakui-mon gate at Mito First High School are not confirmed).
JR Mito Station, North ExitJR Joban Line, Suigun Line, Kashima Rinkai Railway
about 10 min walk · Some climbing
About 10 minutes on foot to the Ote-mon gate. From the North Exit deck, climb Icho-zaka slope toward the third enclosure and Kodokan. By bus, take a Kairakuen-bound bus from North Exit stop 4 for about 3 minutes to Kodokan.[2][8]
Checked: 2026-10-03
Hours and admission
Kodokan
Hours
Feb 20 – Sep 30: 9:00–17:00; Oct 1 – Feb 19: 9:00–16:30
Closed
December 29–31
Admission
Adults 420 yen; elementary/junior high students and seniors 70+ 210 yen; groups of 20+ 320 yen (students 160 yen). Free for preschoolers, and for everyone on Ibaraki Prefecture Day (November 13).[6][9]
Checked: 2026-10-03
Ninomaru corner turret
Hours
9:30–16:00
Closed
December 29 – January 3, in bad weather, and when humidity jams the sliding doors
Kodokan parking (13 spaces, free), the lot in front of Ote-mon Plaza (free), and the Prefectural Sannomaru Office lot (about 150 spaces, paid; show your ticket at Kodokan's ticket office for 3 hours free). Large buses use Kodokan's bus lot (3 spaces).[8]
Checked: 2026-10-03
Grounds opening hours
Opening hours of the walking route not confirmed.Checked: 2026-10-03
Time neededEditors' estimate
About 1 hour for the gate, turret and moats; around 2 hours if you also visit Kodokan.
Steps, slopes and footing
From the station you climb a slope (Icho-zaka) onto the plateau. Inside the castle there are bridges over dry moats and ups and downs along the ramparts.[1][8]
Wheelchairs and strollers
Kodokan is a historic building with steps, and some areas cannot be reached by wheelchair; a barrier-free map is available.[9]Checked: 2026-10-03
Toilets and rest
Not confirmed
English signs / audio guide
Not confirmed
Seasons
The castle site is lit up at night (dates and hours not confirmed).[1]
Photography
Not confirmed
Works, closures and restrictions
Kodokan switches to winter hours (9:00–16:30) from October 1.[6]Checked: 2026-10-03
Editors' guide
An editorial guide based on sources and confirmed information — not a first-hand visit report.
Who will enjoy it
Good for those curious about castles built of earth rather than stone, anyone who wants to see newly rebuilt wooden gates and turrets, and fans of the Mito domain and late-Edo history. It is walkable from the station.
What makes it interesting
The Ote-mon gate and Ninomaru turret are new wooden buildings made with traditional methods. Compare them with the deep dry moats and tall ramparts at their feet to see how a castle could defend itself without stone walls. At Kodokan, look for the main hall and Shizendo, which survive from the Edo period.
Before you go
Most of the site is school grounds you cannot enter. The three-story turret that served as the keep burned in 1945. The Ninomaru turret may close in bad weather or high humidity.
Ways to enjoy it
Climb Icho-zaka from the station to Kodokan, then cross the Ote Bridge, pass through the Ote-mon gate and follow the Mitogaku-no-Michi to the Ninomaru turret. From the bridges, look down to gauge how deep the moats are. If you have time, come back for the night illumination.
Photos
Visitor reviews
Be the first to review
Have you visited this castle? We'd love to hear from you.
Write a review
Open questions
The claims about its length ranking fourth in Japan, being one of the largest earth-built castles, and having a uniquely structured keep come from Mito City's public-relations column.
The dates of Satake's (1593) and Yorifusa's (1625) rebuilding follow the Japan Castle Foundation list. The Satake-era date of the Yakui-mon gate is traditional.
Visiting conditions for the Yakui-mon gate, walking-route hours, illumination times, toilets, English guidance, photo rules and the location of the 100 Castles stamp could not be confirmed.
Souka KinmeiCC0Wikimedia Commons
