Daignault was a senior vice-president at the agency and responsible for commercial finance, corporate- and asset-based lending and project finance as well as an equity investment program.
He was appointed to a five-year term as head of the export credit agency.
Daignault fills the vacancy left by the departure of Stephen Poloz, who quit EDC to become governor of the Bank of Canada last year.
Before joining the EDC in 2004 as a senior vice-president for business development, Daignault spent more than 10 years with General Electric Capital.
Pierre Gignac, who had been serving as acting president and CEO since June 2013, will return to his position as senior vice-president, enterprise risk management, and chief risk officer.