Ohara was born in what is now Nagaoka, Niigata as the third son of Tanaka Keijiro, a former samurai, the son of an impoverished former samurai, but was later adopted by Ohara Tomotada, a former samurai from Aizu Domain, and took the Ohara surname.
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Ohara was appointed as Deputy Minister of Justice under Yoshimichi Hara in the Tanaka administration, serving in the same post under the subsequent Hamaguchi, Inukai and Saito administrations.
Ōhara Station | Naoshi Mizuta | ''Wave'', 1916 painting by Maurice Denis. 100 × 124 cm. Ohara Museum of Art | Tapiche Ohara's Reserve | ''Music Hall''. 1903. 153 × 138.5 cm. Ohara Museum of Art | Hajime Ohara |