It means people can only leave home for four reasons – to buy food, to attend medical appointments or to pick up supplies, to exercise once a day and for essential travel to work.
Police have powers to enforce the lockdown rules and can arrest and fine offenders.
To report people who you think are breaking the Covid-19 measures in Derbyshire, visit this page on the Derbyshire Constabulary website.
You can also send a send a private message on the Derbyshire Constabulary Facebook page or send a direct message via the force’s contact centre on Twitter
During a Government briefing on Saturday, NHS England medical director Stephen Powis said: “It’s the lives and the health of all of us – our friends, our relatives, your friends, your relatives – that depend upon us following these instructions.”