The supreme justice of Egypt's Supreme Constitutional Court has been sworn in as the nation's interim president, replacing the Islamist Mohammed Mursi who was ousted by the military.
"I swear to preserve the system of the republic, and respect the constitution and law, and guard the people's interests," Mansour said as he took the oath of office at a ceremony in the Supreme Constitutional Court.
"We are looking forward to hold the presidential and parliamentary elections," Mansour vowed.
Egypt's interim president praised protesters saying that June 30 Revolution has united Egyptians without discrimination.
According to military decree, Mansour will serve as Egypt's interim leader until a new president is elected. A date for that vote has yet to be set.
Defense minister, armed forces chief General Abdel Fattah al-Sisi ousted Mursi, suspended the constitution and ordered to hand over the power to the head of the supreme constitutional court.
The armed forces acted to remove Mursi after millions of Egyptians demonstrated for four days against rule.