Biya received nearly 54 percent of the votes, while the opposing candidate Issa Tchiroma Bakary only received 35 percent. The official message came from Cameroon's Constitutional Council on Monday.
The challenger, who was previously closely associated with Biya, claimed that he won the election. It was rejected by the ruling party CPDM.
The election was held on October 12, and the election campaign was marked by violence and deadly violence. Opposition candidate Tchiroma's supporters defied the demonstration ban and clashed with security forces on several occasions.
Biya thanked the voters for their support and said that he "honestly hopes to be able to build a peaceful, united and flourishing Cameroon".
The violence continued on Monday. Several people were shot dead in the city of Garoua when a crowd gathered at the opposition leader's residence. Tchiroma claimed that snipers were in the houses opposite him, reports the British BBC.
The voter turnout was 58 percent.
