Nishimuro earned a bachelor's degree in economics from Keio University in 1961.
He joined Toshiba (then Tokyo Shibaura Denki) after graduation, rising to chairman in 2000.
He received the Legion of Honour officer award in 2015.
Following his hospitalization in February 2016, he was succeeded as CEO by Masatsugu Nagato, who had been president and CEO of Japan Post Bank.
Nishimuro's death was reported on 18 October 2017. He was 81.