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Andrew RT Davies has give up as leader of the Welsh Conservative group within the meeting after seven years in cost.
He had been criticised inside the party for suggesting corporations like Airbus had been undermining Brexit by warning they may shut UK crops.
In a assertion he mentioned it was with "deep regret" that he had resigned, after a group assembly on Wednesday.
Mr Davies mentioned "nothing could make me prouder" than having the assist of the party's grassroots members.
"It has been a huge privilege to serve in this position since 2011, after securing the mandate of the party in a ballot of the membership," he mentioned in a resignation assertion.
"It is my agency perception that any leader of the meeting group ought to safe the identical mandate in a full poll of the grassroots, and I hope that my successor will emerge in that method.
"I wish to thank the group for his or her assist all through my management, and specifically to specific my gratitude to the numerous devoted workers I've had the privilege to work withand for.
"I sit up for supporting whoever emerges from the competition to switch me, and I can't cease to put all of my efforts into advancing the Welsh Conservative trigger each right here in Wales and Westminster.
"As a party we might obtain nothing with out the onerous work and dedication of our grassroots and I wish to thank all of them for the assist they've given me in Wales. Nothing might make me prouder than to have loved their backing all through this journey.
"I wish to thank the prime minister for her assist and I want her the easiest in delivering for the nation and the Conservative Party transferring ahead.
"And finally, thanks to my family, particularly my wife Julia who has supported me each and every step of the way."