Izutaro Suehiro graduated from German Law Department of Tokyo University (1912). He then taught as assistant professor at his alma mater (from 1914) and studied civil law in Switzerland, France and Italy (1918). After returning home he was promoted to professor and held chair of civil law.
He served as dean of Law Department (1933-1946) until he was subjected to the Purge Directive issued by the Allied Force, after Japan's capitulation in World War II. Thenceforth he was active mainly as chairman of Central Labor Commission, ably managing the commiission in its early days of existence and his judgment and ability were highly valued at the time of each big strike. It was also during his tenure as chairman of the commission that he devoted his energy to drafting the Labor Law and he was also conspicuous in the field of amateur sports serving as chairman of the Japan Swimming League and vice-chairman of Nihon Taiikukai (Japan Amateur Athletic Association).
He was depurged in 1951 but died in the same year at the age of 63. This was followed by establishment of Suehiro Hakase Kinen Jigyokai (Business Society for Commemoration of Dr. Suehiro) with many dignitaries from the various fields of activity as its sponsors.