Ukip deputy chairman Diane James has won the contest to replace Nigel Farage as the party's leader.
The MEP, who was the frontrunner in the contest, took the top job with 8,451 votes.
The new leader said the party had "moved mountains on the political landscape" and was the "change movement of the United Kingdom".
She also said the Government was stealing her party's ideas, calling the prime minister "Magpie May".
Nigel Farage has vowed he will not "meddle" or attempt to influence the next leader of Ukip, but remains committed to the party's ideals.
"I wish them the very best of luck and my job is not to meddle," he told delegates at the party conference in Bournemouth, ahead of the results of his party's leadership election.
"My job is not to try and influence, but my job will be if that leader wants any help and advice then, make no mistake about it, I am still four-square behind this party and its aims," Mr Farage said.
The frequently outspoken Ukip leader said he would remain engaged in political life, and suggested he might "go back to America" for a speaking engagement, a reference to an appearance he made at a rally for US Republican presidential candidate Donald Trump last month.
Douglas Carswell has insisted he will "absolutely not" quit Ukip after Nigel Farage said he "really isn't doing anything for us".
With the election of Diane James, Ukip has tipped the gender balance in British politics, but true diversity is still some way off.
The grammar-educated former healthcare sector worker made her political name in defeat and holds Vladimir Putin up as a leadership mentor.