Issei Shiraishi and Kiyoshi Itō, Students of Tokyo Imperial University, posed for photos on 1935.
Kiyoshi Itō, Official of the Cabinet Statistics Bureau, posed for photos at the Cabinet Statistics Bureau in Tōkyō City, Tōkyō Prefecture on 1940.
Kiyoshi Itō, Professor of the Faculty of Science, Kyoto University, posed for photos on 1954. This photo appeared in Japanese passport published by the Ministry of Foreign Affairs on 1954.
Seitarō Itō and Kiyoshi Itō posed for photos on 1916.
Seizō Itō, Kiyoshi Itō, Tsuyo Itō and Seitarō Itō posed for photos with Seihachi Itō and Mishi Itō on 1937.
The Empire of Japan presented the letter of appointment for the Official of the Cabinet Statistics Bureau to Kiyoshi Itō on May 8, 1939.
Tokyo Imperial University presented the letter of appointment for the Research Assistant of the Faculty of Science, Tokyo Imperial University to Kiyoshi Itō on June 19, 1940.