Biden takes oath of office as 46th US President
After vowing to uphold and defend the Constitution of the United States, Joe Biden has officially been sworn in as US president.
His oath of office was administered by Supreme Court Justice John Roberts.
Biden was sworn in on a Bible that has been in his family since 1893 and was used during his swearing-in as vice-president in 2009 and 2013, according to CBS News.
The same Bible was also used each time he was sworn in as Delaware senator.
The book itself is five inches (12.5cm) thick with a Celtic cross on the cover.
The family Bible was also used by his late son Beau when he was sworn in as Delaware attorney general in 2013.