As Yasunao MATSUDAIRA, the head of Nagasawa Matsudaira clan and the lord of the Fukaya Domain, died without an heir in 1593, Matsuchiyo, soon after birth, succeeded the Nagasawa Matsudaira clan and became the lord of the Fukaya Domain in the following year.
文禄2年（1593年）に長沢松平家当主で深谷藩主でもある松平康直が嗣子なくして没したため、その翌年、生後間もなく長沢松平家を継ぎ、深谷藩主となった。