- Died: 1582
Tsuchiya Tadanao was the son of Tsuchiya Masatsune, and a retainer of the Takeda clan. He married a daughter of Okabe Tamba-no-kami. Tadanao died in battle alongside Takeda Katsuyori in 1582. His second son, Tsuchiya Katsutane, married a daughter of the Sôma clan and was adopted into the family, becoming Sôma Tadatane and head of the Sôma.
- Arai Hakuseki, Joyce Ackroyd (trans.), Told Round a Brushwood Fire, University of Tokyo Press (1979), 280n22.