On April 10, 1195, Moritsuna accompanied Yoritomo on his visit to the Imperial Palace when Yoritomo came to Kyoto for memorial service for Todai-ji Temple, and he was appointed as Hyoe no jo (Lieutenant of the Middle Palace Guards) at this time.
建久6年（1195年）4月10日、東大寺供養の為に上洛した頼朝の参内に従い、この時には兵衛尉に任じられている。