* Image is for illustrative purposes only.Kariya Castle (Kame Castle)
刈谷城（亀城）
Kariya Castle (Kame Castle) is a historic castle in Chūbu dating from the Founded in Tenmon 2 (1533) by Mizuno Tadamasa. Noted as the birthplace of Ōdai-no-Kata, mother of Tokugawa Ieyasu. During the Edo period, served as the seat of Kariya Domain with 23,000 koku, whose lord was Mizuno Tadamasa (founded Tenmon 2, 1533) → Mizuno Nobuoto and Mizuno Tadashige → Matsudaira Tadayoshi (grand-uncle of Tokugawa Ieyasu) → succeeded by the Doi, Matsudaira, Honda, and other clans as lords of Kariya Domain until the Meiji Restoration.
Overview
Kariya Castle (Kariyajō), located in Shiromachi, Kariya, Aichi Prefecture, is a Sengoku and Edo period castle founded in Tenmon 2 (1533) by Mizuno Tadamasa, a regional daimyo who controlled the border region between Mikawa and Owari provinces. Also known as "Kame Castle," it survives today as a castle-ruin park beloved by local residents. Its greatest historical significance lies in its position as the main castle of the Mizuno clan—the family of Ōdai-no-Kata, mother of Tokugawa Ieyasu—and was cherished throughout the Edo period as one of the roots of the Tokugawa shogunate.
The Mizuno clan were kokujin (provincial gentry) with influence in the Mikawa-Owari border region from the mid-Muromachi period onward, and skillfully preserved their position among powerful neighbors (the Imagawa, Oda, and Tokugawa clans). Kariya Castle was built on a low plateau overlooking Kinuura (present-day Kinuura Port) as a hirayamajiro (low-rise mountain castle), exploiting a naturally strong position surrounded by sea and wetland. The castle's southern face was protected by Mikawa Bay (Kinuura), with moats on the north and east; the name "Kame Castle" is said to derive from the terrain resembling a tortoise in shape.
In Tenmon 10 (1541), Ōdai-no-Kata, daughter of castle lord Mizuno Tadamasa, married Matsudaira Hirotada, and the following year in Tenmon 11 (1542), she gave birth to the future Tokugawa Ieyasu (childhood name Takechiyo). However, two years later in Tenmon 13 (1544), when the Mizuno clan broke ranks with the Imagawa to side with the Oda, Ieyasu was left behind in Okazaki Castle (as the Mizuno were forced to sever ties with the Matsudaira family, then under Imagawa control, Ōdai-no-Kata was separated from her young son Takechiyo). This event is celebrated as emblematic of the hardship Ieyasu endured in his childhood, and Kariya Castle remains the legendary stage of their tragic parting.
During the Edo period, Kariya Castle served as the administrative center of Kariya Domain under successive lords of the Fukamizō Matsudaira, Hisamatsu Matsudaira, Inagaki, Abe, Honda, Miura, and Doi clans. With the Abolition of the Han System (1871), the castle lost its function and its structures were demolished; however, ruins centered on the main enclosure, second enclosure, and third enclosure remain and are now developed as "Kame Castle Park." It is designated an Aichi Prefecture Historic Site and serves as a cultural and tourism center for Kariya.
Connection to Swords
Kariya Castle holds special significance as a castle intimately connected to Tokugawa Ieyasu's birth and as a junction between the Tokugawa shogunate and Japanese sword culture. The most striking connection between the Mizuno clan, Kariya Castle, and blades lies in their ties to the celebrated swords associated with Tokugawa Ieyasu. Ieyasu is renowned for collecting and possessing numerous celebrated swords throughout his life, and his mother's birthplace, Kariya Castle, forms an essential context for understanding Ieyasu's engagement with sword culture. Ieyasu is said to have possessed many celebrated blades including Muramasa, Monokichi Sadamune, and Sohaya-no-Tsuruki, and many of the swords favored by Ieyasu throughout his life are currently preserved in the Tokugawa Art Museum (Nagoya) and the Kunozan Tōshō-gū Museum (Shizuoka). The Mizuno clan themselves, as a prominent family within the Mikawa warrior aristocracy, possessed and wielded many fine swords. Mikawa province was historically home to the "Mikawa smiths," and master blademakers working in the Sadamune tradition or influenced by Masamune were active throughout the Mikawa-Owari region from the mid-Muromachi period through the early modern era. Although there are no definitive historical records confirming whether swordsmiths were permanently stationed in Kariya Castle's castle town, as one of the heartlands of Mikawa martial culture, it is considered to have played an important role in sword demand and distribution. Additionally, Mizuno Nobuoto, successor to Mizuno Tadamasa (Ieyasu's maternal grandfather and first lord of Kariya Castle), maintained an alliance with Oda Nobunaga until just before the Battle of Okehazama (1560) and is said to have brokered the alliance between Nobunaga and Ieyasu (the Kiyosu Alliance). The Kiyosu Alliance (1562) stands as one of the most pivotal political partnerships in Japanese history, and it is considered that sword exchanges and gifts accompanied its formation, suggesting that Kariya Castle may have played a role in this diplomatic event.
Highlights
- Kame Castle Park (Main and Second Enclosure Ruins) — The castle's core; a municipal park where visitors can explore the remains of moats and earthen ramparts
- Birthplace of Ōdai-no-Kata — The natal home of Tokugawa Ieyasu's mother; the Kariya City History Museum interprets Ieyasu and the Mizuno clan's history
- Sakura at Kame Castle Park — Approximately 180 trees including Edo higan and Somei yoshino; a celebrated spring viewing destination at this castle ruin
- Kariya City History Museum — Permanent exhibits of artifacts and reconstructed models relating to Kariya Castle, the Mizuno clan, and Kariya Domain
- Tokugawa Art Museum (Nagoya, approximately 30 minutes by car) — One of Japan's foremost samurai culture museums, housing celebrated blades, armor, and tea ceremony utensils associated with Ieyasu
- Kenkon-in Temple (Higashiura Town) — Family temple of the Mizuno clan; enshrines a life-sized stone statue of Ōdai-no-Kata
* Opening hours and admission fees are subject to change. Please check the official website before visiting.