On May 22, 1672, Nagashige transferred to the position of osoba-kosho (a servant working beside the shogun) and was given the rank of Jugoinoge (Junior Fifth Rank, Lower Grade) and was appointed as the governor of Sado Province.
寛文12年(1672年)4月25日御側小姓に移り、12月28日従五位下佐渡守に叙任した。