Tens of thousands of people cheered as William Ruto was sworn in as Kenya’s president at a ceremony in the capital Nairobi following his narrow election win last month.
With his hand on a Bible, the 55-year-old swore to preserve and protect the country’s constitution.
Defeated candidate Raila Odinga did not attend, saying he had “serious concerns” about his opponent’s victory.
Mr Ruto won the election with 50.5% of the vote, to Mr Odinga’s 48.8%.
Mr Odinga has alleged that the result was rigged, but the Supreme Court has ruled the election was free and fair.
At least eight people were reported to have been injured in a crush as they jostled to enter the stadium to witness the swearing in of both Mr Ruto and his deputy Rigathi Gachagua.
But inside the stadium the crowd was in high-sprits, with frequent cheering, waving the Kenyan flag, and pockets of groups proudly wearing yellow – the colour synonymous with Mr Ruto’s campaign.
Mr Ruto was handed a copy of Kenya’s constitution and a sword to represent the transfer of power.
There was also a handshake between outgoing President Uhuru Kenyatta and Mr Ruto, his former deputy with whom he fell out during their second term in office.