The Shinano-Ogasawara clan was the line of Mochinaga OGASAWARA which was divided into three – the main line, Fuchu-Ogasawara clan (Fukashi-Ogasawara clan) and Suzuoka-Ogasawara clan in Suzuoka-jo Castle which is the line of Muneyasu OGASAWARA and Matsuo-Ogasawara clan (Ina-Ogasawara clan) in Matsuo-jo Castle (Ina County of the Shinano Province) which is the line of Mitsuyasu OGASAWARA.
信濃小笠原氏は、小笠原持長の系統で本来は嫡流の府中小笠原氏（深志小笠原氏）と、小笠原宗康の系統で鈴岡城を居城とする鈴岡小笠原氏と、小笠原光康の系統で松尾城(信濃国伊那郡)を居城とする松尾小笠原氏（伊那小笠原氏）と三分されていた。