As a groundbreaker in Japan's democratic politics, Itagaki enjoyed high popularity even after his death, and his portrait was depicted on fifty sen Government and 100 yen Bank of Japan notes.
没後も、日本の民主政治の草分けとして人気が高く、戦後、50銭政府紙幣、日本銀行券B100円券に肖像が用いられた。