CastleHilltop castle (hirayamajiro)Next 100 Fine Castles No. 104
What makes this castle distinctive
The last battlefield of Toyotomi Hideyoshi's campaign to unite Japan, with main-enclosure stone walls, raised after the castle fell, that are thought to be the oldest castle walls in the Tohoku region.
Why?
In 1591 Kunohe Masazane, a member of the Nanbu clan, rose in revolt here and was besieged by an army of about 60,000 sent by Hideyoshi; the castle fell. This battle is said to have completed Hideyoshi's unification of the country. Afterward Gamo Ujisato and others rebuilt the castle in the Toyotomi style, adding stone walls to the main enclosure.[1][3][5]
Three things not to miss
01
The main enclosure's stone walls, thought to be Tohoku's oldest
Where
Around the main enclosure (honmaru), along the dry moat between it and the second enclosure
What to look at
The stones stacked with little shaping, in the style called nozura-zumi (rough natural stone)
Why it's interesting
They are thought to have been built right after the castle fell by the Anoshu, specialist stonemasons working under Gamo Ujisato. Ninohe City says they share the style of Nagoya Castle in Saga and Aizu-Wakamatsu Castle. Castles in northern Tohoku were usually made of earth, so these walls show Toyotomi-style castle building arriving here.[1][5]
Can you see it?
Visible from outsideVisible outdoors. Some paths may be closed for ongoing site improvement work.
02
The view from the corner turret site
Where
A corner of the main enclosure, where the earthen bank becomes high and wide
What to look at
The layout of the castle below and the surrounding hills
Why it's interesting
At 139 m above sea level, this is the highest point of the castle. A corner turret (yagura) once stood here for watching and firing on the enemy. From here you can take in the castle's layout and see the hills where Hideyoshi's huge army set up camp.[5][1]
Can you see it?
Visible from outsideThe turret is gone, but you can stand on its site.
03
The Shiratori River cliffs beyond the second enclosure
Where
Head north along the moat-bottom path from the site of the rear gate (karamete) of the second enclosure
What to look at
The sheer drop to the Shiratori River below
Why it's interesting
Kunohe Castle was surrounded by rivers on three sides, and on the north the cliffs of the Shiratori River protected it. Looking down, you can see why an army of 60,000 struggled to take it. This is also where the old road the Kunohe family used to travel to Kunohe Village slants down the slope.[1][5]
Can you see it?
Visible from outsideOutdoors. Watch your step near the cliff edge.
At a glance for visitors
Nearest station
5 min walk from Donko Inari Jinja-mae bus stop (bus from Ninohe Station)
Climb
Not confirmed
Time neededEditors' estimate
Allow about an hour to walk around the ruins, plus about 30 minutes for the Archaeological Center's exhibition.
Admission
Not confirmed
Hours
10:00–15:00
Access
Open to visitors
The ruins are an open-air historic park you can walk around. Some paths are closed for improvement work (per the city's notice as of October 2026). The Next 100 Castles stamp is at two places: the Kunohe Castle Guide House and the Ninohe City Archaeological Center.
Kunohe Castle is a hilltop-and-plain castle (hirayamajiro) built on a plateau bounded by rivers, including the Mabechi River to the west and the Shiratori River to the north. Covering about 360,000 square meters, it was divided by dry moats into enclosures such as the honmaru, ninomaru, sannomaru, Matsunomaru, Wakasadate and Todate. Using its rivers and cliffs, it was one of the larger castles in Tohoku.[1]
02
Tradition
A medieval castle of the Kunohe family
Kunohe Castle is said to have been built in the Meio era (1492–1501) by Kunohe Mitsumasa, four generations before Kunohe Masazane. The Kunohe were a branch of the Nanbu clan and steadily grew in power. Parts such as Wakasadate and Todate still keep the curving, terrain-following shape of the Kunohe-era castle.[1][4]
03
Historical record
1591: Kunohe Masazane's revolt
When Nanbu Nobunao won a succession dispute to become head of the Nanbu clan, Kunohe Masazane opposed him and raised troops in March 1591. Because Hideyoshi had recognized Nobunao, Masazane was branded a rebel against the ruler of Japan, and in September an army of about 60,000 surrounded the castle. Tradition says about 5,000 defended it. Struggling, the attackers sent the abbot of the Kunohe family temple as an envoy, urging surrender in return for sparing the women and children.[1][3]
04
Historical record
A betrayed surrender, and what the bones tell
Masazane accepted and opened the gates, but it was a trick, and tradition says the people inside were cut down. Masazane and his chief retainers were executed at Sanohasama, in today's Kurihara, Miyagi Prefecture. In 1995, a crude grave near the main gate of the second enclosure yielded the headless remains of more than ten people. The bones bear many sword wounds and are thought to be victims of the fall of the castle that local tradition had long described.[1][3][4]
05
Historical record
Rebuilt Toyotomi-style as Fukuoka Castle
After the siege, on Hideyoshi's orders, Gamo Ujisato rebuilt the castle in the Toyotomi style, mainly the honmaru, ninomaru and Matsunomaru, and handed it to Nanbu Nobunao. Nobunao renamed it Fukuoka Castle and made it the Nanbu clan's base. Burned household items and matchlock bullets found in the fill under the main enclosure show that the ground was leveled after the battle. The Nanbu later moved their seat to Morioka Castle, and this castle was abandoned in 1636.[1][4]
06
Historical record
Locals kept calling it Kunohe Castle
The ruins became a National Historic Site in 1935. The Nanbu named it Fukuoka Castle, but out of attachment to the Kunohe family, who had ruled for over a century, local people kept calling it Kunohe Castle, and that is the name of the historic site. Ninohe City has carried out excavations and improvements since 1989, buying up the land and turning it into a historic park. In 2017 it was selected as one of the Next 100 Fine Castles of Japan.[1][4][8][7]
Human remains with sword wounds are found in the second enclosure[4]
Selected as one of the Next 100 Fine Castles of Japan[7]
Buildings and remains
The keep today
Not yet confirmed
According to Ninohe City, no roof tiles have been excavated, so it is unknown whether the rebuilt Fukuoka Castle had a keep or turrets. The earlier Kunohe castle probably had board-roofed turrets, but their locations are unknown. No buildings stand today.
The site today
A historic site in the center of Ninohe that the city is developing as a historic park. Most of the sannomaru (third enclosure) is now built-up town. The castle covers about 360,000 square meters, of which about 210,000 are designated.
Main buildings
Site only
Main enclosure front gate and wooden bridge
Site of the gate and bridge on the east side of the main enclosure. Foundation stones remain, and the city names them as structures that could possibly be reconstructed.[1]
Site only
Main enclosure corner turret
The high, wide part of the earthen bank marks the turret site.[1][5]
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)
Not yet confirmedwhether a keep existed is still being checkedEditorial article
National Historic Site (Kunohe Castle ruins) (1935)Editorial article
Selection
Next 100 Fine Castles No. 104Japan Castle Foundation
Visiting
Access
Open to visitors
The ruins are an open-air historic park you can walk around. Some paths are closed for improvement work (per the city's notice as of October 2026). The Next 100 Castles stamp is at two places: the Kunohe Castle Guide House and the Ninohe City Archaeological Center.
Address
Shironouchi, Fukuoka, Ninohe, Iwate (Kunohe Castle Guide House: 3-3 Shironouchi, in the Kunohe Castle entrance plaza)[7]
Checked: 2026-10-03
Nearest stations and how to get there
Donko Inari Jinja-mae bus stop (bus from Ninohe Station)From Ninohe Station (Tohoku Shinkansen, IGR Iwate Ginga Railway), take a JR Bus bound for Ninohe Hospital / Karumai Hospital or an Iwate-ken Hoku Bus bound for Ibonai
Ninohe City Archaeological Center (exhibition room)
Hours
9:00–17:00
Closed
Mondays, the day after national holidays (except Saturdays and Sundays), December 29 – January 3
Admission
Exhibition room: adults 50 yen, elementary and junior high students 20 yen (group discounts for 10+)[7]
Checked: 2026-10-03
By car / parking
About 25 minutes from Jobouji IC or 15 minutes from Ichinohe IC on the Hachinohe Expressway. Some roads around the castle are narrow; tour buses should contact the Ninohe City Archaeological Center. The city recommends searching car navigation by address (3-3 Shironouchi, Fukuoka, Ninohe).[6][7]
Checked: 2026-10-03
Grounds opening hours
Not confirmedChecked: 2026-10-03
Time neededEditors' estimate
Allow about an hour to walk around the ruins, plus about 30 minutes for the Archaeological Center's exhibition.
Steps, slopes and footing
Uneven ground with earthen banks and dry moats; some routes run along moat bottoms and near cliff edges.[5][1]
Wheelchairs and strollers
Not confirmedChecked: 2026-10-03
Toilets and rest
Not confirmed
English signs / audio guide
Not confirmed
Seasons
Cherry trees bloom in spring around the zigzag entrance (koguchi) of the main enclosure.[5]
Photography
Not confirmed
Works, closures and restrictions
Some paths are closed for site improvement work (fiscal 2025 project). Volunteer guides are available early April to late November, 10:00–15:00; book at least a week ahead through the Ninohe Tourism Association (0195-23-3641).[1][5][7]Checked: 2026-10-03
City facility with exhibits on Kunohe Castle, on the 3rd floor of the Ninohe General Welfare Center building. It also keeps the Next 100 Castles stamp.[7]
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
For anyone interested in the last battles of the Warring States period, or in how Tohoku castle building differed from the Toyotomi style. There are no buildings, but the banks, dry moats and stone walls survive well, and you can explore the castle's terrain on foot.
What makes it interesting
Look at the honmaru stone walls as a trace of Toyotomi castle building brought to Tohoku. Then compare the curving Kunohe-era sections such as Wakasadate with the straight-edged, rebuilt honmaru to see two castles from two eras layered on one site.
Before you go
Some paths may be closed for improvement work. The guide house opens only from mid-April to November; in winter, use the Archaeological Center for the stamp and exhibits.
Ways to enjoy it
Climb first to the corner turret site to take in the whole castle and the hills where Hideyoshi's forces camped; the siege becomes much easier to picture. Volunteer guides are available if you book ahead.
Photos
Visitor reviews
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Open questions
The founder and date (Kunohe Mitsumasa, Meio era) are traditional. Sources also differ on when the Kunohe family moved here.
The claim that the stone walls are Tohoku's oldest comes from Ninohe City and its Archaeological Center, which describe it as "thought to be" or "said to be" the oldest.
The massacre of those in the castle is known from tradition and later war chronicles; the bones from the second enclosure are thought, after re-examination by Tohoku University, to be its victims.
Sources describe the timing of the Nanbu move to Morioka differently (construction of Morioka Castle began under Nobunao, and the move is credited to a later generation).
Only one reusable photo of the ruins could be found. Park hours, toilets, accessibility, English signage and any guide house fee could not be confirmed.
