Shun'ichi Kase (加瀬 俊一, Kase Shun'ichi; October 23, 1897– September 9, 1956) was a Japanese diplomat both during and after World War II. Shun'ichi Kase was a secretary to Japanese Foreign Minister Yōsuke Matsuoka in 1941. Then he was chargé d’affaires in Italy, as of 1943. Subsequently, he served as Japanese Ambassador to Switzerland (in 1945), Japanese Ambassador to Mexico (in 1952), and Japanese Ambassador to West Germany (1953-1956). The names Shun'ichi Kase and Toshikazu Kase are spelled in Japanese using the same characters, but are two different people. Toshikazu was a bureau chief in the foreign office in Tokyo who also served as secretary to several foreign ministers.
Source: “Shun'ichi Kase”, English Wikipedia (CC BY-SA 4.0), excerpt