立憲民政党
In the 1915 General Election, Tanomogi was elected to the House of Representatives of Japan under the Rikken Dōshikai political party. He was elected a total of nine times, changing his party affiliation to the Kenseikai (where he was Chairman of the Policy Affairs Research Council), and the Rikken Minseitō (where he was Secretary-General and Director of General Affairs). He became Undersecretary of Communications under the Katō administration and the first Wakatsuki administration, and was subsequently Communications Minister in the Hirota administration from March 1936 to February 1937.