KIKUTAKE Jitsuzo (1889-1946), a policy maker for Mongolian affairs in the early "Manchukuo" era, assumed vice directorship of the Xing'an Bureau (Xing'anju) on June 1, 1932 and resigned as vice director of the Xing'an Office (Xing'an Zongshu) on December 19, 1933. Unfortunately, no comprehensive study on the cause of his resignation has been made to date. Through analyzing primary sources in the KATAKURA Tadashi Collection, the author came to a conclusion that KIKUTAKE's resignation can be ascribed to the disagreement over the dismissal of OZAWA Iroha, the supervisor of the Darqan Banner police, in a discord within the "Manchukuo" government over how to rule the Mongols. The author also tries to elucidate actions taken by KATAKURA and KIKUTAKE, after the latter resigned from the office and attempted to make a comeback in politics of "Manchukuo."