The Mayor of London took the seat and then thanked his wife, Marina, and Hillingdon Council.
He said: "It's been a fantastic campaign in London.
"The people of Britain, after a long and exhausting campaign, have spoken."
Earlier in the evening, Mr Johnson told getwestlondon: "You can't count your chickens, but the exit poll is obviously very encouraging.
"I think the Conservatives will do well."
And he was right..!