In 1594, he took over as head of the family and became the first feudal lord of the Odawara Domain, Sagami Province with 65,000 koku (a unit of volume: rice 1-koku is 180.39 liter) when his father, Tadayo, died.
文禄3年（1594年）、父・忠世が死去したため、家督を継いで相模小田原藩6万5000石の領主（のち初代藩主）となる。