Boris Johnson won 66 percent of the vote, taking home 92,153 votes against rival Jeremy Hunt’s 46,656. In total, 138,809 Conservative Party members cast their vote, deciding the fate for the entire country of over 66 million. You can have YOUR say in our exclusive poll below and leave your comments in the comments section at the bottom of the page.
The former London mayor will officially take over from Theresa May on Wednesday and move into Downing Street.
In his victory speech, Mr Johnson promised to “deliver Brexit” and “unite the country”.
Foreign Secretary Mr Hunt said he was “very disappointed”, but Mr Johnson would do “a great job”.
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What has the reaction been?
Outgoing PM Theresa May tweeted: “Many congratulations to Boris Johnsnon being elected leader of Conservatives – we now need to work together to deliver a Brexit that works for the whole UK and to keep Jeremy Corbyn out of government.
“You will have my full support from the back benches.”
Labour Leader Jeremy Corbyn tweeted: “Boris Johnson has won the support of fewer than 100,000 unrepresentative Conservative Party members by promising tax cuts for the richest, presenting himself as the bankers’ friend, and pushing for a damaging No Deal Brexit.
“But he hasn’t won the support of our country.”
READ MORE: Brexit LIVE: Barnier just reacted to Boris becoming PM – might not be what you expect…
EU chief negotiator, Michel Barnier, tweeted: “We look forward to working constructively w/ PM Boris Johnson when he takes office, to facilitate the ratification of the Withdrawal Agreement and achieve an orderly #Brexit.
“We are ready also to rework the agreed Declaration on a new partnership in line with #EUCO guidelines.”
Guy Verhofstadt, the European Parliament’s chief Brexit co-ordinator, said the parliament would hold an extraordinary meeting on Wednesday in response to Mr Johnson’s election.
US President Donald Trump also sent his congratulations to Mr Johnson, tweeting: “He will be great!”
International Development Secretary Rory Stewart congratulated Mr Johnson but confirmed he’d retreat to the backbenchers.
Justin Secretary David Gauke, another vocal opponent of a no-deal Brexit, also announced his return to the backbenches.