New Northampton South MP David Mackintosh has taken part in a photo call with Prime Minister David Cameron on his first day in the job.
The former Northampton Borough Council leader as well as new Corby MP Tom Pursglove are among 74 new Conservative MPs that have been elected.
Mr Mackintosh has replaced Brian Binley, who has retired, as the MP for Northampton South.
The Conservative candidate, who received 16,163 votes, beat his nearest rival Kevin McKeever (Labour), who received 12,370 votes.
Mr Mackintosh said he was “looking forward to the challenges ahead” in his new role.
He said: “I wish Brian Binley all the best in his retirement and I would like to thank all the people who voted for me, they put their trust in me and I won’t let them down.”
Conservative candidate Tom Pursglove ousted Labour’s Andy Sawford to take the Corby constituency in the General Election, with a majority of more than 2,000 votes.