Col Mamady Doumbouya has been sworn is as Guinea’s interim president after leading a coup which saw the overthrow of Alpha Condé.
The former French legionnaire, 41, becomes Africa’s second-youngest leader, after Mali’s Assimi Goïta, 38, who also staged a military takeover.
Col Doumbouya is barred from contesting future elections, under a transitional charter published this week.
The 5 September coup has been widely condemned.
Both West Africa body Ecowas and the African Union have suspended Guinea.
Ecowas also imposed sanctions against the coup leaders and demanded a return to constitutional order within six months.