 He was promoted to lieutenant in February 1905, to captain in December 1909, to major in November 1916 and to lieutenant colonel in August 1920.Nishio was first attached to the 10th Regiment/10th Division from 1921 to 1923; he was promoted to colonel on 6 August 1923.Afterward, he was an instructor at the Army War College until 1925 when he became commanding officer of the 40th Regiment/10th Division.