Yasuhiko was appointed on the 17 of December 2019 as Grand Steward of the Imperial Household. Because it was so close to the
2020 Summer Olympics, the event was postponed until 2021. Yasuhiko released a statement about the Olympics saying "From what I gather, the emperor is concerned about holding the Tokyo Olympic and Paralympic Games, for which he serves as honorary president, while people are voicing anxiety over whether it will lead to a spread of infections,". To which the then
Prime Minister of Japan,
Yoshihide Suga, said that "Nishimura had purely voiced his personal views." An argument was also made against his comments, saying, "The Japanese Emperor is not allowed to engage politically according to the Constitution. He must make sure to observed it." In April 2021, Yasuhiko also precised over the marriage of then
Princess Mako of Akishino, to Kei Komuro. He said that a previous statement she made on her marriage was "Explained very well" but also said that "The public will make their own assessment". The marriage later went through. After
Kei Komuro released documents explaining his mother's financial issues, which were put into question and quite controversial, Yasuhiko said that "This document has allowed me to understand the facts and circumstances." In 2024, he went on to speak about the
Japanese imperial succession debate by saying that it was an "Extremely important matter" and "Steps will be taken after sufficient debate has occurred." In December 2025, Yasuhiko announced his retirement, effective on December 24, 2025, and he will be succeeded by vice steward,
Buichiro Kuroda. He was succeeded by Buichiro on the 24th as planned. ==Post-Grand Stewardship==