Here are 5 things she said after the announcement:
I am grateful for your support. It has been a hard-fought contest. The contest has shown the breadth and depth of talent in the Conservative party. I would like to thank Rishi Sunak.
I also want to thank our outgoing leader, my friend, Boris Johnson. Boris, you got Brexit done. You crushed Jeremy Corbyn. You rolled out the vaccine, and you stood up to Vladimir Putin. You are admired from Kyiv to Carlisle.
During this leadership campaign, I campaigned as a Conservative and I will govern as a conservative. And my friends, we need to show that we will deliver over the next two years.
I will deliver on the energy crisis, dealing with people's energy bills, but also dealing with the long term issues we have on energy supply. And I will deliver on the National Health Service.
But we all will deliver for our country. And I will make sure that we use all the fantastic talents of the Conservative party, our brilliant members of parliament and peers, our fantastic counsellors, our MSs, our MSPs, all of our councillors and activists and members right across our country. Because, my friends, I know that we will deliver, we will deliver, and we will deliver.
Former Prime Minister Liz Truss Loses Her Seat By 630 Votes In UK Election "World Was Safer": Ex UK PM Liz Truss Backs Donald Trump For US Presidential Race Ex-UK PM Liz Truss Admits To "Mistakes" Over Her Disastrous Short-Lived Tenure 2 French Rafale Jets Collide Mid-Air, Instructor, Pilot Missing "Pivotal Moment": Key Doctor Body Resumes Strike 2 Days After Calling It Off Ayatollah Khamenei Warns Of "Divine Wrath" If Iran Backs Down Against Israel "Pivotal Moment": Key Doctor Body Resumes Strike 2 Days After Calling It Off Navalny's Wife Rejects Finding He Died From "Combination Of Illnesses" After Night Of Vandalism, Forensic Team Reaches Kolkata Hospital: 10 Points Track Latest News Live on NDTV.com and get news updates from India and around the world.