Camborne and Redruth MP George Eustice has announced he will be standing down at the next election.
The former environment secretary says he wants to pursue a career outside of politics, but has vowed to continue to work hard for his constituents over the final two years of his term.
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. This has been a difficult decision for me.
“I feel a deep bond to the area where my family have lived for over 400 years and it has 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.”
Mr Eustice became Camborne and Redruth MP in 2010, winning with just a 66-vote majority - the smallest of any Tory in 2010 - before winning a further three elections to gain an 8,700 majority at the last one in 2019.