Marugame Castle Ruins: A Hilltop Fortress Crowned by Japan's Tallest Stone Walls
Rising gracefully above the city of Marugame in Kagawa Prefecture, the Marugame Castle Ruins (Marugame-jō ato) preserve one of Japan's most extraordinary works of early Edo-period military architecture. Perched atop the small hill of Kameyama, the castle is most famous for its breathtaking stacked stone walls — a layered series of ramparts that, when measured from base to summit, reach a combined height of approximately 60 meters, the tallest of any Japanese castle. Crowning this fortress is a small but elegant three-tiered wooden keep, one of only twelve original castle keeps surviving in Japan today. The entire castle precinct was designated a National Historic Site (Kuni Shitei Shiseki) on March 31, 1953, ensuring that this remarkable layered stronghold remains preserved for generations to come.
A Layered History on Kameyama Hill
The story of Marugame Castle stretches back to the early Muromachi period, when Nara Motoyasu, a retainer of the powerful shogunal deputy Hosokawa Yoriyuki, is said to have built a small fortress on Kameyama. The site's true rise to prominence, however, came in the late sixteenth century. In 1587, the warlord Ikoma Chikamasa was granted the province of Sanuki by Toyotomi Hideyoshi, and in 1597 he and his son Kazumasa began constructing a new castle on Kameyama as a subsidiary stronghold of nearby Takamatsu Castle. The fortress was completed in 1602.
The Tokugawa shogunate's "One Castle per Province" decree (Ikkoku Ichijō Rei) of 1615 forced Marugame's abandonment, and for a time the site lay dormant. Its rebirth began in 1641, when Yamazaki Ieharu was installed as the first daimyō of the newly established Marugame Domain. With special permission from the shogunate, he commenced a major reconstruction in 1643. After the Yamazaki line ended without an heir in 1657, the Kyōgoku family took over in 1658 under Kyōgoku Takakazu and completed the castle as it stands today, with the keep finished around 1660 and the great gate completed in 1670. The Kyōgoku family ruled Marugame for seven generations until the Meiji Restoration.
Why Marugame Castle Is a National Historic Site
Marugame Castle's designation as a National Historic Site recognizes its exceptional value as a remarkably intact example of early Edo-period castle planning and construction. Although modest in overall size, the castle preserves a complete and well-defined layout, with the main bailey at the summit, the second bailey slightly below to the east, and the third bailey wrapping around the hillside, complemented by belt-shaped enclosures along the southern flank. The lord's residence stood at the western foot of the hill, and the entire core was enclosed by a square moat, with the main gate opening to the south.
What makes the site especially valuable is the dramatic visual effect of its tiered stone walls — described in the official designation as creating a "spectacular" sight that, together with the surviving keep and main gate, evokes the original character of a complete castle complex. The keep, the Ōte-ichi-no-mon (Outer First Gate), and the Ōte-ni-no-mon (Outer Second Gate) are all separately designated National Important Cultural Properties, making Marugame one of the most thoroughly preserved early modern castles in Japan.
Highlights to Seek Out
The Towering Stone Walls — "Ōgi no Kōbai"
The signature feature of Marugame Castle is its four tiers of stone walls, which sweep upward from the hillside in a graceful concave curve known as ōgi no kōbai, or "the slope of a folding fan." The third bailey alone preserves a section of stone wall reaching about 22 meters in height, and the cumulative tiered height exceeds 60 meters — the tallest combined castle stonework in Japan. The walls combine rough natural-stone (nozura-zumi) bases with refined corner stacking (sangi-zumi), gradually rising to a near-vertical crest. Their craftsmanship has earned Marugame the affectionate nickname "the castle of stone walls."
The Smallest Surviving Wooden Keep
Standing roughly 15 meters tall, Marugame's three-storied keep is the smallest of Japan's twelve surviving original castle keeps. Despite its modest dimensions, it is beautifully proportioned, with delicate Chinese-style (karahafu) and triangular (chidorihafu) gables and white plastered walls. Climbing the steep wooden staircases inside offers a rare opportunity to experience an authentic seventeenth-century interior. From the top, sweeping views extend over the Marugame plain, the Seto Inland Sea, and the famed Seto Ōhashi Bridge.
The Ōte-mon Gate Complex
At the foot of the hill, the Ōte-ichi-no-mon and Ōte-ni-no-mon form a classic masugata (square enclosure) gateway, both rebuilt around 1670. The Ōte-ichi-no-mon, known as the "Drum Gate," once announced the hour with the beat of a great drum. The tradition continues today: a drum is sounded at noon, making Marugame the only surviving castle in Japan where this practice carries on year-round.
The Mikaeri-zaka Climb
The path leading from the gates to the keep, called Mikaeri-zaka — "the slope where you turn back to look" — is a steep climb framed by towering stone walls. Visitors are continually rewarded with new views as the layered ramparts and white keep come into sight from different angles.
Around Marugame: What to See Nearby
Marugame's compact city center makes it easy to combine a castle visit with other cultural experiences. Just a short distance away lies Nakatsu Banshō-en, an Edo-period stroll garden created in 1688 by the second Kyōgoku lord, featuring a pond shaped after Lake Biwa, an ancient pine of immense girth, and Kanchōrō, said to be Japan's oldest surviving sencha tearoom. Marugame is also celebrated as the birthplace of the round paper fan (Marugame uchiwa), a traditional craft that today accounts for the vast majority of uchiwa produced in Japan; visitors can see artisans at work and try fan-making themselves at the Uchiwa-no-Minato Museum near the harbor.
Further afield, the Shiwaku Islands in the Seto Inland Sea — including Honjima with its preserved Kasashima district of historic merchant houses — recall Marugame's maritime past, while the famous Kotohira-gū Shrine (Konpira-san) lies only a short train ride away.
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Q&A
- What is special about Marugame Castle compared to other Japanese castles?
- Marugame Castle is renowned for two distinctions: it possesses the tallest combined stone walls in Japan, rising about 60 meters in four graceful tiers, and it retains the smallest of the twelve surviving original wooden castle keeps. It is also one of only three castles in Japan where both an original keep and an original main gate still stand together.
- When was the castle designated a National Historic Site?
- The entire castle precinct was designated a National Historic Site on March 31, 1953. The keep, Ōte-ichi-no-mon, and Ōte-ni-no-mon are also separately designated as National Important Cultural Properties.
- How long does a typical visit take?
- A brisk walk up to the keep and back takes about 30 minutes. To explore the keep interior, the gates, and Marugame City Museum at a relaxed pace, plan on around one to one and a half hours. The path to the keep is steep, so allow extra time if you prefer a gentle climb.
- Is there an admission fee?
- Entry to the castle grounds is free. A small fee (200 yen for adults, 100 yen for elementary and junior high school students) is charged to enter the keep itself. The Ōte-ichi-no-mon and Marugame City Museum are free to enter.
- When is the best time to visit?
- Spring is especially beautiful, when around 700 cherry trees bloom across the surrounding Kameyama Park during the Marugame Castle Cherry Blossom Festival. Autumn evenings during the "Castle Road" event offer rare nighttime access to the keep, and clear winter days reward visitors with sharp views across the Seto Inland Sea.
Basic Information
| Name | Marugame Castle Ruins (Marugame-jō ato) |
|---|---|
| Other Names | Kameyama Castle, Hōrai Castle |
| Location | Ichiban-chō, Marugame City, Kagawa Prefecture |
| Type | Hilltop castle (hirayamajiro), elevation approx. 66 m |
| Original Construction | Begun 1597 by Ikoma Chikamasa; completed 1602 |
| Reconstruction | Begun 1643 by Yamazaki Ieharu; completed under Kyōgoku Takakazu, with the keep finished around 1660 and the main gate around 1670 |
| National Historic Site Designation | March 31, 1953 |
| Other Designations | The keep, Ōte-ichi-no-mon, and Ōte-ni-no-mon are National Important Cultural Properties; selected as one of Japan's Top 100 Castles |
| Keep Opening Hours | 9:00 a.m. – 4:30 p.m. (last entry 4:00 p.m.) |
| Keep Admission | Adults (high school and above): 200 yen / Children (elementary and junior high): 100 yen |
| Access | About 15 minutes on foot from JR Marugame Station; about 20 minutes by car from Sakaide IC or Zentsūji IC |
| Managing Body | Marugame City |
References
- Marugame Castle Ruins — Cultural Heritage Online (Agency for Cultural Affairs)
- https://bunka.nii.ac.jp/heritages/detail/217529
- Marugame Castle Keep — Cultural Heritage Online (Agency for Cultural Affairs)
- https://bunka.nii.ac.jp/heritages/detail/191123
- Marugame Castle Ōte-ichi-no-mon — Cultural Heritage Online (Agency for Cultural Affairs)
- https://bunka.nii.ac.jp/heritages/detail/148481
- History and Cultural Properties — Marugame City Official Website
- https://www.city.marugame.lg.jp/page/1009.html
- Visiting Hours and Admission — Marugame City Official Website
- https://www.city.marugame.lg.jp/site/castle/7454.html
- Marugame Castle — Marugame City Tourism Association
- https://www.love-marugame.jp/spot/295
- Marugame Castle — Wikipedia
- https://ja.wikipedia.org/wiki/丸亀城
Last verified: 2026.05.02