Ōkubo Tadamasa

In this Japanese name, the family name is Ōkubo.
Ōkubo Tadamasa
Born (1692-07-28)July 28, 1692
Edo, Japan
Died November 20, 1732(1732-11-20) (aged 40)
Edo, Japan
Nationality Japanese
Other names Kaga no Kami
Occupation Daimyō of Odawara Domain (1713–1732)
Spouse(s) daughter of Yanagisawa Yoshiyasu

Ōkubo Tadamasa (大久保 忠方, June 15, 1692 November 20, 1732) was the 4th daimyō of Odawara Domain in Sagami Province, (modern-day Kanagawa Prefecture) in mid-Edo period Japan. His courtesy title was Kaga no Kami.


Ōkubo Tadamasa was the sixth son of Ōkubo Tadamasu, the second daimyō of Odawara, and was born at the domain’s residence in Edo. He became clan leader and daimyō of Odawara on the death of his father in 1713. At the time, 6,000 koku of his revenues were transferred to his younger brother.

Tadamasa faced the daunting task of attempting to reduce the massive debt incurred by his father to the Tokugawa shogunate due to the Great Genroku earthquake and the Hōei eruption of Mount Fuji, and associated aftershocks, crop failures and floods. Although he encouraged the migration of artisans to Odawara and the opening of new rice lands, high taxation and increasingly severe inflation led to civil unrest in Odawara-juku. Tadamasa died of illness on November 20, 1732, at the domain's Edo residence, His grave is at the clan temple of Saisho-ji in Setagaya, Tokyo.

Tadamasa was married to an adopted daughter of Yanagisawa Yoshiyasu, the senior advisor to Shogun Tokugawa Tsunayoshi.


Preceded by
Ōkubo Tadamasu
3rd Daimyō of Odawara
Succeeded by
Ōkubo Tadaoki

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