When Okinawa Ocean Expo '75 was held in Okinawa Prefecture in 1975, he visited the prefecture for the first time after being installed as the Crown Prince, where his father (the Emperor Showa) had also visited in the Crown Prince Hirohito days.
昭和50年（1975年）、沖縄国際海洋博覧会に際し父も皇太子時代に訪問した沖縄県を立太子後はじめて訪問。