With 99.66% of the votes counted, Ecuador's electoral council April 4 confirmed former Vice President Lenín Moreno's win in the presidential elections.
Juan Pablo Pozo Bahamonde, the head of national electoral body CNE, said the result was "offical and irreversible."
According to the CNE, Moreno, the candidate of the governing Alianza Pais, won with 51.16% of the vote in an April 2 runoff election to replace his party ally Rafael Correa, who has been president since 2007.
Conservative Guillermo Lasso, who has demanded a recount after exit polls seemed to favor him, received 48.84% of the tallied votes.
Moreno's win marks a broad continuation of outgoing leftist President Rafael Correa's policies. Moreno served as Correa's vice president between 2007 and 2013.
The new president will take office May 24.