The former John Lewis chief will lead the West Midlands Combined Authority and the cabinet consisting of the seven West Midlands Council Leaders.
Thanking his team, Street said: "I want to be a mayor who works for everyone across the West Midlands and binds all of our leaders together.
“That’s because ultimately that's what this job is all about - about building a team to champion the West Midlands, building an alliance with central government, with local people, that will put the West Midlands back in its rightful place as the leading region of the UK."
At the end of a close content, Street came out on top over Labour candidate Sion Simon by only around 4,000 votes.
A West Midlands mayor was part of the devolution deal between the WMCA and the government, which will see more than £1.1bn made available for investment in the region over the next 30 years.
Paul Faulkner, chief executive of the GBCC, said: “We look forward to working with Andy to help make the region the best possible place to start, grow and move a business and ensure a strong business voice is heard in the West Midlands Combined Authority.“While the General Election is understandably taking a significant amount of media and political attention at present, we would urge the new mayor not to lose time in their (relatively short) 3-year term and get straight to the business of establishing their office and delivering for the region.”
The Phoenix Newspaper wishes him well in his new role!