"Now we will have three ambulances on the road and two extra helping hands, which is well needed," she said.
"There's a lot of demand in Rotorua and we have been waiting for this for a long time, so we're very pleased to see it come to fruition."
She said the new staff members were likely to start in about July.
St John chief executive Peter Bradley said the changes would have many benefits for patients, including more effective services and response times.
"It's another step to achieving our ambition of right care, right time," he said.
Mr Bradley said the initiative would be the first part of a five-year workforce plan.
Jobs will also be created in Auckland, Christchurch, Waihi, Temuka, Hamilton, Whangarei, Alexandra, Picton and Feilding.
He expected to have 20 staff on board by July 1 and the remaining 37 by January 2015.
St John also announced it will invest half a million dollars into a volunteer sustainability strategy, to help meet the challenges of recruiting and retaining volunteers.