CastleMountain castle (yamajiro)Japan's 100 Fine Castles No. 55
What makes this castle distinctive
On the mountain next to Nobunaga's Azuchi Castle stood a huge hilltop castle that was walled in stone before Azuchi was even built.
Why?
Kannonji was the castle of the Rokkaku family, the shogunate-appointed governors (shugo) of Omi Province, today's Shiga Prefecture. Stone-walled castles spread across Japan only after Azuchi Castle, but Shiga Prefecture believes Kannonji was already fitted out with stone walls in the 1530s–1550s. Terraces edged with big stones still lie scattered across the mountain.[1][2][3]
Across the valley from the grounds of Kannonshoji Temple, at the enclosure traditionally called Hirai-maru, near the main enclosure.
What to look at
The huge stones stacked on both sides of the gateway (koguchi) and the stone steps leading up into the enclosure.
Why it's interesting
The Honmaru, Hirai-maru and Ikeda-maru area is thought to have been the heart of the castle, and it is ringed by imposing walls of large stones. Shiga Prefecture notes that stone walls on this scale were very rare in castles built before Azuchi.[1][2][4][8]
Can you see it?
Visible from outsideReachable on foot along mountain paths. Undergrowth can make the walls hard to see in some seasons.
The stairway and foundation stones of the main enclosure
Where
The area traditionally called the honmaru, or main enclosure (west of Kannonshoji along the mountain path).
What to look at
The broad stone stairway, the foundation stones that once held up building pillars, and the stone walls.
Why it's interesting
When the linked-verse poet Tani Soboku visited in 1544, he wrote that he was shown into a reception room in a two-story building on the mountain, with fine tea utensils laid out in a tea room. Excavations in 1969–70 also turned up tea wares and Chinese ceramics, showing this was both a fortress and the Rokkaku family's home.[1][5][7][11]
Can you see it?
Visible from outsideThe remains are open to walk around. No buildings survive.
The tall stone wall of the lord's residence site in Ishidera
Where
The Tenmangu shrine at the highest point of Ishidera village, at the southern foot of Mount Kinugasa.
What to look at
The roughly 6-meter stone wall supporting the shrine's terrace, and the way its corner stones are stacked.
Why it's interesting
The place name Kami-Goyoyashiki survives here, and the spot is identified as the site of the Rokkaku lord's residence. Shiga Prefecture calls this the tallest stone wall in the whole castle. Its corners are stacked unevenly, which looks old, yet it resembles the walls of Hirai-maru up on the mountain. Ishidera is thought to have been the castle town.[1][2]
Can you see it?
Partly visibleIt lies inside a village, so visit quietly and respect residents. The site has not been excavated.
At a glance for visitors
Nearest station
90 min walk from JR Azuchi Station
Climb
Steep climb
Time neededEditors' estimate
About 1–2 hours for the core of the site if you drive up the forest road; allow half a day if you hike up from the station.
Admission
Adults (high school and older) 800 yen; elementary and junior high students 500 yen; preschoolers free (revised May 1, 2026)
Hours
8:00–17:00
Access
Open to visitors
The castle site is open to walk along mountain paths. Parts of it are private land, so stay on the paths and take your litter home; no smoking or fires. Kannonshoji Temple in the middle of the site charges admission (whether you must pay just to see the ruins is not confirmed). The route up from Kuwanomidera Temple requires an entry fee.
The castle takes its name from Kannonshoji Temple (called Kannonji in the Middle Ages) at the center of the mountain. The first record comes from the war chronicle Taiheiki, which describes Sasaki (Rokkaku) Ujiyori setting up camp at the temple in the 14th century as the "fortress of Kannonji." Mount Kinugasa, 432 m high, looks over the plain east of Lake Biwa, and the Tosando highway (later the Nakasendo) ran along its foot.[1][2][11]
02
Scholarly interpretation
Home of the Rokkaku, governors of Omi
The Rokkaku were the main line of the Sasaki clan, which served as shugo (shogunate-appointed governor) of Omi from the Kamakura period to the end of the Warring States era. At first they only used the temple as a temporary camp. Shiga Prefecture believes they rebuilt it into a stone-walled residence for the head of the family in the 1530s–1550s, when records of construction work cluster. Their power peaked under Rokkaku Sadayori.[1][2]
03
Historical record
A fortress and a home
The poet Tani Soboku, who visited in 1544, wrote that he was led to a reception room in a two-story hall on the mountain, with prized tea utensils ready in a tea room, and was given a treasured old manuscript as he left. The village of Ishidera at the foot of the mountain is thought to have been the castle town, and a 1549 document declares its "new market" a free market (rakuichi) open to all traders. Shiga Prefecture describes it as the first free market on record.[1][2]
04
Historical record
1568: leaving without a fight
In 1563, the lord Rokkaku Yoshisuke (Yoshiharu) had his senior retainer Goto Katatoyo and his son killed inside the castle. In this "Kannonji Incident" many vassals burned their mansions in the castle and abandoned the family. In 1568, when Oda Nobunaga marched toward Kyoto with Ashikaga Yoshiaki, the future shogun, the Rokkaku refused to guide him through Omi. Nobunaga's army invaded, and Rokkaku Shotei (Yoshikata) and his son fled to the Koka area without a fight, ending Rokkaku rule over Omi.[1][2]
05
Scholarly interpretation
The buildings vanished; stone walls and terraces remain
Excavations found traces of a large fire, but when it happened does not match the records and traditions. Once Azuchi Castle was completed in 1579, Kannonji seems to have lost its purpose. Stone walls and terraces survive all over the mountain, but many may be the remains of Kannonshoji's subtemples, and telling them apart from castle remains is still an open question.[1][2]
06
Historical record
Studied as a National Historic Site
The site was excavated over two years from 1969 and became a National Historic Site in 1982, with more land added in 1984. Shiga Prefecture drew up conservation and development plans in 2004–2007 and surveyed the stone walls across the whole castle in 2008–2011. In 2009 bamboo and trees were cleared, revealing earthen ramparts and tiers of stone walls that had been hidden. The castle was named one of Japan's 100 Fine Castles in 2006.[1][4][7][10]
Sasaki (Rokkaku) Ujiyori camps at Kannonji temple, recorded in the Taiheiki as its "fortress"[1][11]
The poet Tani Soboku is received in the two-story hall on the mountain[1]
The Ishidera new market at the foot of the mountain is declared a free market[1][2]
The Kannonji Incident; vassals turn away from the Rokkaku[2]
Oda Nobunaga invades Omi; Rokkaku Shotei and his son abandon the castle without a fight[1]
Designated a National Historic Site (area extended in 1984)[4]
Selected as No. 52 of Japan's 100 Fine Castles[10]
Buildings and remains
The keep today
No keep was built
A medieval mountain castle without a keep (tenshu). Records mention a two-story hall on the mountain, but it was not a keep.
The site today
Stone walls and terraces survive in the forest from the summit of Mount Kinugasa down its southern slopes. Kannonshoji Temple stands in the middle of the site, and Ishidera village at the foot of the mountain is thought to be the former castle town. Parts of the site are private land.
Main buildings
Site only
Honmaru (main enclosure, by tradition)
Stone walls, a stairway and foundation stones remain. No buildings survive.[1][5]
Site only
Hirai-maru and Ikeda-maru (by tradition)
Enclosures ringed by walls of large stones. Several tiers of stone walls run down the ridge south of Ikeda-maru.[1]
Site only
Lord's residence site (Tenmangu shrine, Ishidera)
Believed to be the site of the Rokkaku residence. A stone wall about 6 m high survives. Not excavated.[2]
Key facts
Type
Castle
Setting
Mountain castle (yamajiro)built on a mountain; expect a climbEditorial article
Period
Medieval (c.1185–1570s)Editorial article
Keep (tenshu)
No keep was builtthe castle never had a keepEditorial article
National Historic Site (Kannonji Castle ruins) (1982)Editorial article
Selection
Japan's 100 Fine Castles No. 55Japan Castle Foundation
Visiting
Access
Open to visitors
The castle site is open to walk along mountain paths. Parts of it are private land, so stay on the paths and take your litter home; no smoking or fires. Kannonshoji Temple in the middle of the site charges admission (whether you must pay just to see the ruins is not confirmed). The route up from Kuwanomidera Temple requires an entry fee.
About 90 minutes on foot from the station to the castle site, according to the prefecture's tourism site. Prefectural materials give about 30 minutes to the Kuwanomidera trailhead (entry fee required) or about an hour to the Ishidera trailhead. Rental bicycles are available at the station. Every route is a real mountain climb.[7][2]
Checked: 2026-10-03
JR Notogawa Station (by bus)JR Biwako Line, then Ohmi Railway bus (Kanzaki Line, for Yokaichi Station) to Kannonji-guchi
about 40 min walk · Steep climb
40 minutes on foot from the Kannonji-guchi bus stop to Kannonshoji Temple, according to the temple. There is no bus to the temple from Azuchi or Omi-Hachiman stations.[6]
Checked: 2026-10-03
Hours and admission
Kannonshoji Temple
Hours
8:00–17:00
Closed
Not confirmed
Admission
Adults (high school and older) 800 yen; elementary and junior high students 500 yen; preschoolers free (revised May 1, 2026)[6]
Checked: 2026-10-03
By car / parking
Two paid forest roads lead toward Kannonshoji. The Gokasho road on the Higashiomi side (back approach) is open only 8:00–16:30 and closed over the New Year; from the upper parking lot it is a 10-minute walk to the temple. The Ishidera road on the Omihachiman side (front approach) is open only 9:00–16:00 and closed from late December to early March; from its parking lot you climb about 400 stone steps. Either may close for ice or snow. Large vehicles cannot use the roads.[6][7]
Checked: 2026-10-03
Grounds opening hours
No set opening hours were found for the castle site itself. The forest roads are closed outside their hours.[6]Checked: 2026-10-03
Time neededEditors' estimate
About 1–2 hours for the core of the site if you drive up the forest road; allow half a day if you hike up from the station.
Steps, slopes and footing
This is a mountain castle, so expect trails and stone steps. The front approach to Kannonshoji has about 400 steps and takes 50–60 minutes to climb. The local tourism association estimates 90–120 minutes up and 60–90 minutes down on foot. Come prepared for a hike.[5][6][8][2]
Wheelchairs and strollers
No wheelchair-accessible route was found; the site is mainly mountain paths and stone steps.Checked: 2026-10-03
Toilets and rest
Not confirmed
English signs / audio guide
No English information was confirmed. The tourist information center in front of Azuchi Station shows a video about the castle (in Japanese).[8]
Seasons
The tourism association notes that in summer, overgrowth can hide the remains. The Ishidera forest road is closed in winter (late December to early March).[8][6]
Photography
Not confirmed
Works, closures and restrictions
According to the tourism association, the Japan 100 Castles stamp for Kannonji is kept at the Azuchi Castle Archive Museum in front of JR Azuchi Station (check locally for the current location).[8]Checked: 2026-10-03
Prefectural museum presenting finds from the excavations at Azuchi and Kannonji. Open 9:00–17:00 (last entry 16:30); closed Mondays (or the next day after a holiday) and December 28 – January 4. About 10 minutes by car to the Azuchi side of Kannonji.[5]
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 curious about keepless mountain castles and the history of stone walls, visitors who want to see Omi before Nobunaga alongside Azuchi Castle, and people who enjoy a hike.
What makes it interesting
The stone walls and gateways of the Honmaru, Hirai-maru and Ikeda-maru. See for yourself how large the stones were, decades before Azuchi Castle. Near the top, the view opens over the plain east of Lake Biwa.
Before you go
No buildings survive. Every route is a climb, and the forest roads have limited hours and close in winter. Kannonshoji's admission went up to 800 yen in May 2026. The prefix "den-" on enclosure names means the names come from tradition.
Ways to enjoy it
Get a picture of the castle first at the Azuchi Castle Archaeological Museum or the tourist office by Azuchi Station; the walls in the woods will make much more sense. On the way down, walk through Ishidera village to see the tall wall of the lord's residence site.
Photos
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Open questions
Shiga Prefecture says many of the terraces may be the remains of Kannonshoji's subtemples rather than the castle, and the two have not yet been told apart.
The founding date is unknown; the Japan Castle Foundation lists both 1335 and 1471 with question marks. The dating of the stone-walled rebuilding to the 1530s–1550s is Shiga Prefecture's view.
The location of the Ishidera new market is debated: one view places it near Oiso Shrine, another just south of Ishidera village.
The enclosure names (Honmaru, Hirai-maru and so on) are traditional, not confirmed.
Not confirmed: whether visiting only the ruins requires Kannonshoji's admission, toilet locations, photo rules, and the temple's closing days. The prefectural museum's page still lists the temple's old 500-yen fee; the temple's own site gives 800 yen from May 2026.
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