The Nikkei 225 added 263.31 points to sit at 19,709.01, while the broader Topix index of all first-section shares climbed 1.22 per cent, or 18.85 points, to 1,569.15.
Markets breathed a sigh of relief as the vote result effectively eliminates any risk of France leaving the eurozone -- a departure advocated by the eurosceptic Le Pen.
Initial estimates showed Macron, a 39-year-old former investment banker, winning between 65 per cent and 66.1 per cent of the ballots -- higher than expected -- and Le Pen scoring between 33.9 per cent and 35 per cent.
But many observers are sceptical about Macron's ability to win a parliamentary majority, meaning he might have to form a coalition of lawmakers committed to his agenda.
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The philosophy and literature lover is inexperienced, has no political party and must try to fashion a working parliamentary majority after legislative elections next month.
His economic agenda, particularly plans to weaken labour regulations to fight stubbornly high unemployment, are likely to face fierce resistance from trade unions and his leftist opponents.
Le Pen, 48, had portrayed the ballot as a contest between Macron and the "globalists" -- in favour of open trade, immigration and shared sovereignty -- and her "patriotic" vision of strong borders and national identities.