Shinshiro Castle


ShinshirojouChris (2).jpg


As Nagashino Castle had been badly damaged during the Battle of Nagashino in 1575, its young master — one of the heroes of the campaign — Okudaira Nobumasa, abandoned Nagashino and relocated to Shinshiro, building a new castle on the land currently around the Shinshiro Elementary School’s main playground and forming the new jokamachi, castle town to the north. This new castle was named, Shin-Shiro (新城) or New Castle, and as there was another castle also known as Shinshiro, this one was named Shinshiro-Jo,…or New Castle Castle.

Okudaira Nobumasa was still only 21 years of age at the time of Shinshiro Castle’s construction, and so his father-in-law, Tokugawa Ieyasu, is said to have assisted in determining the location. Because of his bravery in action and steadfast loyalty to the Tokugawa, he was given Ieyasu’s eldest daughter, Kamehime, in marriage. Not only Ieyasu’s daughter, but according to the legend, an equally impressed Oda Nobanaga offered the young man the honor of adopting one of the kanji characters from his name — a very high honour — changing his name from Sadamasa to the better remembered Nobumasa The castle itself was around 500 x 500 meters in size, with the Toyokawa River protecting the southern flank, and fortified samurai residences built around the other three sides. In the central south was the large Honkuruwa, or main bailey, surrounded by a thick dorui, an earthen embankment around four meters high and over four meters wide at the base, forming a 100 x 100 meter upside down U shape. The section facing the river was opened but protected by sharp cliffs. Within this section was the large Goten, a palace-like structure containing over 70 rooms, serving partially as the lords’ living quarters as well as audience chambers and administrative offices. These structures remained until around 1887. The dorui were destroyed with the expansion of the school in the early Showa period, circa 1940. A ring of trees around the outer edges of the school ground mark the site of the old dorui.

Tokugawa Ieyasu was transferred to the Kanto region in 1590, and Okudaira Nobumasa went with him. In his place, Katagiri Hanemon, a vassal of Ikeda Terumasa of nearby Yoshida Castle became the castelan. The Mizuno clan, Ieyasu’s mother’s family, were installed in Shinshiro after the Battle of Sekigahara.

In 1648, Tokugawa clan Hatamoto Suganuma Sadami was transferred along with 200 of his samurai and their families from Tamba (Kyoto) with 7,000 koku to Shinshiro Castle. As the Suganuma had neither the rank nor the income to be castle holders, Shinshiro Castle was demoted to Jinya status. During the Suganuma clan’s time at Shinshiro, the area to flourished as a relay point for riverboats and pack horses. The Suganuma clan remained in charge of the Jinya until the Meiji era.

Visit Notes

Today, only a few parts of the dorui and dry moats remain, while the bulk of the land is used as an elementary school grounds. The largest section of dorui remaining is around 20 meters long on the southeastern corner. A tiny section of dorui and a small memorial stone remain on the southwestern corner behind the school’s swimming pool.

Profile by Chris Glenn (edited by ART).

  • Largest section of remaining dorui at Shinshiro.
  • Southeastern corner of the dorui at Shinshiro. The school grounds were the site of the main bailey. (Seen from the principal's office)
  • This row of trees marks the site of the old dorui.
  • Remaining section of dorui on the southwestern corner.

Castle Profile
English Name Shinshiro Castle
Japanese Name 新城城
Alternate Names Shinshiro-jin'ya
Founder Okudaira Nobumasa
Year Founded 1575
Castle Type Hilltop
Castle Condition Ruins only
Designations Local Historic Site
Historical Period Edo Period
Visitor Information
Access Shinshiro Station on the Iida Line; 14 minute walk
Visitor Information Access Limited
Time Required
Location Shinshiro, Aichi Prefecture
Coordinates 34° 53' 47.15" N, 137° 29' 57.55" E
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Added to Jcastle 2022
Contributor 豪谷
Admin Year Visited Viewer Contributed
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