The resolution sponsored by France endorses an African Union decision to give Ivory Coast Prime Minister Charles Konan Banny control of the security forces and other powers to try to reunite the war-divided nation and hold elections before November next year.
It endorses the decision of the African Union's Peace and Security Council that President Laurent Gbagbo should remain head of state from November 1 "for a new and final transition period not exceeding 12 months."
The council had delayed the vote because several council members were concerned about the sweeping powers the draft resolution would give to Mr Banny.
It was understood that four countries, China, Russia, the United States and Tanzania, would have abstained from the vote but all four countries voted for the resolution after France dropped language specifying that the prime minister would have powers to appoint civilian and military officials.