Tatsunosuke Nishimoto graduated from Law Department of Keio Gijuku University (1907).
The same year became assistant at Law Department of his alma mater. Tatsunosuke Nishimoto became professor of Preparatory Department of the same university (1908). Went to Germany for study (1911). He returned home and became professor of Law Department of the same university (1913). Retired and became emeritus professor of Keio University (1944) and thereafter became president of San-in Junior College (since 1950).