Incumbent Rwandan president Paul Kagame won 93 per cent of the votes, according to the electoral commission, in an election that opponents said was marred by repression and violence.
Mr Kagame, widely lauded for rebuilding Rwanda and establishing peace in the aftermath of the 1994 genocide, won the last election in 2003 by a similar margin.
"We are very happy with the conduct of the electoral process, from the campaign to the voting itself. We did not get reports of intimidation from anywhere," said Charles Munyaneza, executive secretary of the electoral body.
The vote count is provisional pending its signing-off by the Supreme Court. Turnout for Monday's election was more than 95 per cent in all the nation's five provinces.
Mr Kagame's nearest rival, Jean Damascene Ntawukuliryayo of the Social Democratic Party, won 5 per cent. Prosper Higiro of the Liberal Party garnered just over 1 per cent and Alvera Mukabaramba of the Party for Peace and Concord 0.4 per cent.
Opponents said the other candidates were a democratic smokescreen and stooges of Mr Kagame's Rwandan Patriotic Front (RPF). They also said the campaign playing field had been uneven, with three would-be opposition candidates prevented from registering
to contest the ballot.
One of them, Victoire Ingabire, head of the United Democratic Forces party who faces charges of funding rebels in neighbouring Democratic Republic of Congo and espousing genocide ideology, rejected the result.
"People were not free to vote. They take all measures to threaten opposition, they take all measures to prevent people voting freely. Why don't they give him 100 per cent?" she said.
Human rights groups pointed to mounting violence during the run-up to the election after the shooting dead of a local journalist and the killing of an opposition official who was found nearly beheaded in July.
Despite being poor in natural resources, Rwanda is a rising star in Africa for donors and investors with Mr Kagame feted as a visionary leader and African icon. The International Monetary Fund forecasts its economy will expand by an average of 6 per cent
in the medium term.
Reuters