Japanese Prime Minister Suga Yoshihide has sent a ritual offering to Yasukuni Shrine to mark the two-day autumn festival.
Suga sent a potted plant to the shrine on Saturday.
The shrine honors Japan's war dead. Those remembered include leaders convicted of war crimes after World War Two.
His predecessor Abe Shinzo offered potted plants for the spring and autumn festivals while he was in office. Suga reportedly did not send offerings when he was Chief Cabinet Secretary.
Lower House Speaker Oshima Tadamori, health and welfare minister Tamura Norihisa, and a minister in charge of international exposition, Inoue Shinji, also sent offerings for the autumn festival this year.