David Cameron says he has begun the task of “turning the country around” and wants to “see it through”, as the election campaign gets under way, BBC reports.
Speaking outside Downing Street, the prime minister urged voters to keep him in power to safeguard the recovery and provide the “strong leadership” needed.
He attacked Labour leader Ed Miliband, saying he risked “economic chaos”.
Earlier, Mr Miliband said the Conservatives’ policy on the EU posed a clear “danger” to UK business.
Mr Cameron was speaking after he held a 10-minute audience with the Queen at Buckingham Palace, the last time he is scheduled to meet the sovereign before polling day on 7 May.
Following months of unofficial campaigning, the five-and-a-half week race for No 10 – which commentators say could be most unpredictable election in a generation – has begun in earnest after Parliament was dissolved.