Aleksandar Vucic has handed over the duties of Serbia's president to Ana Brnabic, acting speaker of the National Assembly, the country's unicameral parliament.
"I will hold this office until the people elect a new president," Brnabic said during the ceremony transferring the presidential insignia.
Vucic announced his resignation on September 27.
Under the Serbian constitution, elections for the new head of state must be held no later than December 27.
Snap parliamentary elections in Serbia will take place on October 25. Vucic will head the list of the ruling Serbian Progressive Party (SNS) and become its candidate for prime minister.
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