The 77-year-old incumbent's main rival, Ali Benflis, received 12.18 per cent in an election which saw 51.78 per cent of Algerians cast their ballots, Tayeb Belaiz told a news conference.
"The people have chosen freely, in a climate that was transparent and neutral," Belaiz insisted.
Benflis has already rejected the result, alleging "massive fraud" and "serious irregularities" across the country on polling day, which was also marred by violent anti-vote protests in the eastern Kabylie region that left some 70 people wounded.
The two other candidates, Ali Fawzi Rebaine and Moussa Touati both won less than one per cent.
The election, in which turnout was sharply down compared to the previous one after the opposition called for a boycott, comes a year after Bouteflika suffered a stroke which confined him to hospital for three months and prevented him from campaigning for re-election in person.
