Katy Bourne, who stood as the Conservative candidate in Sussex, was sworn in at a ceremony at the offices of the now-defunct Sussex Police Authority in Brooks Close, Lewes.
Carole Shaves, the vice-chairman of the authority and a serving magistrate, conducted the ceremony by leading Mrs Bourne, from Ansty, through her oath.
Immediately after the ceremony, she began going about her £85,000-a-year role by meeting chief constable Martin Richards.
The police and crime commissioner has the power to hire and fire chief constables. Mrs Bourne will also set police priorities, budgets and the Sussex Police share of council tax.
After her swearing-in, she said: “I am absolutely delighted and extremely honoured to be elected to this position and I look forward to serving the people of Sussex to the best of my ability.
You have the chance to put your questions to Katy Bourne as part of our Your Interview feature. Email them to email@example.com
See the latest news headlines from The Argus:
- Residents angry over late-night violence and drug dealing at popular student night
- Shared bike plan not yet 'fit for purpose'
- Top Tory makes pizza at Hove restaurant chain where apprenticeship pledge is announced
- Woman calls 999 and asks for firefighters after she discovers "large spider" in her house
- Father cheats death as roof caves in around him