The appointment of Ruphin Fortunat Zafisambo comes a week after President Andriy Rajoelina fired his cabinet following days of protests.
Hailing from the administrative corps, Zafisambo studied at the Antsirabe Military Academy in 1991 before receiving his secondary military training in France,
The demonstrations which were prompted by frustration of electricity and water cuts have entered their third week.
They are mostly led by students and youthful activists.