Due to the end of the wars and those from the younger generation who were good at civil administration (civilian party), such as Masazumi HONDA, gaining power as close advisors to Ieyasu and Hidetada TOKUGAWA, military exploit party members such as Tadakatsu were distanced from the center of the Edo bakufu (Japanese feudal government headed by a shogun) and it is said that he was unhappy in his later years.
晩年は、戦乱の収束により本多正純などの若く文治に優れた者（吏僚派）が家康・徳川秀忠の側近として台頭してきたため、忠勝のような武功派は次第に江戸幕府の中枢から遠ざけられ、不遇であったと言われる。