犬山城·Inuyama-jo
The oldest surviving castle tower in Japan — compact, dramatic, and perched above a river just as it was when Oda Nobunaga's family built it in 1537.
¥200
Last entry 16:30
Admission increased to ¥1,000 from March 1, 2026. Children (under 14) ¥200.
Defense Overview
This castle is hard to attack because it uses high ground and difficult natural access to deny attackers an easy approach.
An attacker would first have to fight the site itself before reaching the main defenses. They would have to cross water barriers or moat lines and push through successive outer areas before the core.
Overall score
83/100
Estimated range
77–89
Confidence
A
Strong multi-source support
Radar view
This estimate combines broad terrain, approach, layout, and route-control signals. It is meant to explain the castle's defensive logic in plain English, not reconstruct a single historical attack.
Terrain Advantage
How much the terrain itself seems to help: height, slope, ridges, cliffs, water edges, and limited approach directions.
19/20
Entrance Defense
How awkward and dangerous the first entry looks: gates, bridge or moat crossings, chokepoints, and forced turns.
17/20
Internal Complexity
How hard it seems to keep pushing after entry: layered baileys, depth, compartmentalization, and repeated defensive lines.
16/20
Siege Endurance
A rough sense of long-hold potential: moats, water access, space, storage plausibility, and defensive staying power.
14/20
Strategic Oversight
How much the castle appears to command nearby roads, plains, rivers, basins, harbors, or town approaches.
17/20
Inuyama punches well above its size. Yes, the tower is small and facilities are limited — but standing on the open-air gallery of the oldest original castle tower in Japan, looking down at the river below, is a genuinely moving experience. Combine it with a walk through Inuyama's well-preserved castle town (one of Japan's best) and a cormorant fishing show on the river for a full day.
Inuyama Castle holds the record: its main tower dates to 1537, making it the oldest original castle tower in Japan. While other famous castles have been rebuilt after fires or wars, Inuyama's tower is the genuine article — the same wooden structure that stood here nearly 500 years ago, during the age of warlords and civil war.
For most of its history, Inuyama Castle was privately owned by the Naruse family — descendants of the samurai lords who governed here in the Edo period. This unusual arrangement lasted until 2004, when the family donated it to a foundation. It's a National Treasure (one of only five castle towers with this designation) that was, until recently, someone's family property.
Unlike most Japanese castle towers where upper floors are enclosed, Inuyama has a narrow open walkway (engawa) that wraps completely around the top floor. Standing here with the Kiso River below and rolling hills in every direction gives you an exhilarating sense of what it felt like to survey your domain from a medieval mountain fortress.
Visitor tip
The tower is small — four floors, with each floor getting progressively smaller as you go up. The staircases are steep and the spaces are tight. But the open-air walkway at the top is the reward: it offers a 360-degree panoramic view of the river, the hills, and the historic castle town below. Bring a jacket — it can be cold and windy up here.
Mountain castle
Mountain castle — built on a rocky cliff above the Kiso River, using the natural terrain as its primary defense
Linked compound layout
Compound style — tower and supporting structures connected into a single defensive complex
Original wooden tenshu (main keep) — the oldest surviving castle tower in Japan, dating to 1537. One of 12 original towers and one of five National Treasures.
Natural stone stacking
The stone walls are relatively simple — the rocky cliff itself provides most of the defensive barrier. The walls extend naturally from the cliff face, making it difficult to distinguish where natural rock ends and constructed wall begins.
Cliff Above the Kiso River
The castle sits directly above a rocky cliff dropping down to the Kiso River. Attackers from the north faced an impassable natural barrier. Even today, looking down from the castle to the river far below gives you a visceral sense of how unassailable this position was.
Steep Wooded Approaches
The approaches on the south and east sides climb through steep, wooded terrain where any attacking force would be vulnerable to defenders above them. The paths switch back multiple times, preventing a charging assault.
Oda Nobuyasu — uncle of the future unifier of Japan, Oda Nobunaga — builds the main tower on the rocky cliff above the Kiso River. This is the tower that still stands today.
Oda Nobunaga takes control of Inuyama Castle as part of his campaign to unify the region around Owari Province (modern Aichi). It becomes a strategic outpost on his northern border.
At the Battle of Sekigahara, the lord of Inuyama backs the wrong side. Tokugawa Ieyasu wins and distributes the castle to loyal allies.
The Naruse clan is installed as lords of Inuyama. They will remain in control of the castle — through the Edo period, the Meiji Restoration, and into the modern era — for nearly 400 years.
The Nobi Earthquake causes significant damage to the tower. The Naruse family personally funds the repairs, beginning their long modern tradition of maintaining the castle as private owners.
The Japanese government designates Inuyama Castle's main tower a National Treasure — acknowledging it as the oldest surviving castle tower in Japan and an irreplaceable architectural artifact.
After nearly 400 years, the Naruse family donates the castle to the Inuyama Castle White Imperial Foundation, ending its unusual status as a privately-owned National Treasure.
This drama about Oda Nobunaga's era features Inuyama, which was closely tied to the Oda clan's early history.
Cherry blossom season is beautiful along the Kiso River below the castle. Summer evenings are worth considering for ukai (cormorant fishing) on the river. Autumn foliage against the stone walls and wooden tower is equally stunning.
1.5-2 hours
After the castle, walk south through the Honmachi street — this is one of Japan's best-preserved castle town streets, with traditional merchant buildings, sake breweries, and small restaurants. It's entirely free to walk and often overlooked by visitors who go straight to the train station after the castle.
Admission increased to ¥1,000 from March 1, 2026. Children (under 14) ¥200.
Closed December 29–31. May close during inclement weather (the upper gallery is exposed to the elements).
名古屋城 · Nagoya-jo
📍 Aichi — Chubu
Nagoya Castle is mid-renovation — visit now for the stunning reconstructed palace, return in a few years for the completed wooden tower.
清洲城 · Kiyosu-jo
📍 Aichi — Chubu
Where Nobunaga launched his conquest of Japan and where Hideyoshi's genius at the 1582 conference made him the successor — Japan's most consequential castle for two of its greatest leaders.
大垣城 · Ogaki-jo
📍 Gifu — Chubu
The crossroads castle where Ishida Mitsunari planned his doomed resistance — Ogaki stood at the hinge of the battle that made Tokugawa Japan.
Chubu castles
All castles in the Chubu region
Castles near Nagoya
Tokai region day trips
100 Famous Castles of Japan
Official Japan Castle Foundation list
Surviving castle towers
One of 12 original Edo-period keeps
National Treasure castles
Japan's highest cultural designation
Mountain castles (yamajiro)
Hilltop fortresses using terrain as defense
The nearest station is Inuyama-Yuen Station or Inuyama Station (Meitetsu Inuyama Line). From there it is about 15 minutes on foot.
Adult admission is ¥1,000 and child admission is ¥200.
Inuyama punches well above its size. Yes, the tower is small and facilities are limited — but standing on the open-air gallery of the oldest original castle tower in Japan, looking down at the river below, is a genuinely moving experience. Combine it with a walk through Inuyama's well-preserved castle town (one of Japan's best) and a cormorant fishing show on the river for a full day.
09:00 to 17:00, last entry 16:30.
Plan for about 1.5-2 hours, depending on how closely you want to explore the grounds.