Although it seemed that the domain finally reached stability and security, Tadatomo died suddenly at the hantei (residence maintained by a daimyo) in Kyoto during Sankinkotai (a system under which feudal lords in the Edo period were required to spend every other year in residence in Edo) in 1634.
ようやく家中の安定を見、安心を得たと思われたが、寛永11年（1634年）、参勤交代の途上、京都の藩邸で急死してしまう。