A BBC journalist in the capital city of Bissau reported high voter turnout on Sunday, and 550 international election observers monitored polling stations.
No presidential winner has yet been announced in the 13-candidate presidential race. The top three contenders are former Finance Minister Jose Mario Vaz from the PAIGC, businessman and former deputy chairman of the Chamber of Commerce Abel Incada from the PRS, and independent Nazare de Pina Vieira, widow of former President Joao Bernardo Vieira.
Under Guinea-Bissau's electoral system, the president will be elected by absolute majority and will serve a five-year term. Parliamentary members are elected from 27 multi-member constituencies and serve terms of four years. If necessary, a run-off would be held on May 18.