Long-standing Tory MP George Eustice has decided to step down at the next election.
The former Environment Secretary joined the growing number of Tories opting to quit as fears grow they will lose their seat due to growing Labour support.
Mr Eustice said: "By the time of the next election, I will have been in politics for 25 years, including almost 15 years as a Member of Parliament.
"I will also be 53 and I want the opportunity to do a final career outside politics so have decided not to seek re-election."
He said the decision had been a "difficult one".
Mr Eustice, who has been MP for Camborne and Redruth since 2010, said: "I feel a deep bond to the area where my family have lived for over 400 years and it had been an honour to represent my home towns, but it is important that the Conservatives are able to select a new candidate in good time.
"There are still almost two years left of the current parliament and I will be doing my utmost throughout that time to help my constituents and deliver for Cornwall."
His decision comes after former chancellor Sajid Javid also confirmed last month he will not stand again at the next election.
The top Tory, who has twice stood to be party leader, said he would not contest his Bromsgrove seat for the fifth time - despite having a 23,106-vote majority.
More than a dozen Tories have now announced they will be stepping down, including Bishop Auckland MP Dehenna Davison, who is just 29.
Reality TV junkie Matt Hancock also announced he is stepping down, while other ex-ministers who will not stand again include Crispin Blunt and Mike Penning.
Other senior Tories including ex-minister Chloe Smith and influential backbencher William Wragg have also announced they will not be running again.
Mr Eustice was Secretary of State for Environment, Food and Rural Affairs from February 2020 to September 2022.
He was previously Minister of State at the same department from May 2015 to February 2020.
After 12 years in power, the Conservatives are staring down the barrel of a Labour victory in 2024 if the Prime Minister doesn’t turn things around.
A poll last week revealed just one in five people would vote Tory if an election was held now.
In more bleak news for Rishi Sunak, support for the Conservatives has hit 21% - down 1% on the depth they plumbed a week ago.
The People Polling survey for GB News found 48% of those questioned would vote Labour - up 2% on the previous week.
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