Kemi Badenoch said she will “win back the trust of the public”, as she announced her shadow cabinet.
The new Conservative Party leader appointed former policing minister Chris Philp as shadow home secretary, replacing leadership rival James Cleverly who ruled out taking a senior frontbench role.
She gave senior roles to other former leadership rivals, with Robert Jenrick confirmed as shadow justice secretary and Mel Stride as shadow chancellor.
Mrs Badenoch said: “I am delighted to have appointed my shadow cabinet, which draws on the talents of people from across the Conservative Party, based on meritocracy and with a breadth of experience and perspective, just as I promised during the campaign.
“Our party’s problems will only be solved with a team effort, and I am confident my shadow cabinet ministers will deliver effective opposition as we seek to win back the trust of the public.
“We will now get to work holding Labour to account and rebuilding our party based on Conservative principles and values.
“The process of renewing our great party has now begun.”
The new-look shadow cabinet was meeting for the first time on Tuesday morning.