가즈사 국
, was a "daimyō" in Japan during the Edo period. Masanao's daimyō family was descended from Minamoto Yasuuji (Seiwa-Genji). The descendants of Tsuchiya (1585–1612) lived successively at Kururi in Kazusa Province; after 1669 at Tsuchiura in Hitachi Province; after 1681 at Tanaka in Suruga Province; and then, after 1688, again at Tsuchiura in Hitachi.