Koji Ariyoshi graduated from Ritsumeikan University in 1978. He joined Aflac as senior vice president responsible for sales planning in October 2008. From January through March 2009, he was directly in charge of the Retail Marketing, Alliance Management and Hojinkai Promotion Departments, and from April through December 2009, he oversaw all the marketing and sales departments as deputy director of Marketing and Sales.
He was promoted to first senior vice president and director of Marketing and Sales in January 2010. He was promoted to his current position in January 2012. Before joining Aflac, he worked for Alico Japan as vice president and AXA Life Insurance as senior vice president.