The appointment was announced minutes after state media reported that Sheikh Abdullah bin Khalifa had resigned.
New PM Sheikh Hamad bin Jassem is the mastermind of
Sheikh Abdullah, 48, is a brother of the Emir, Hamad bin Khalifa, who has ruled since 1995.
No official reason was given for his resignation, but political observers said it did not come as a surprise after persistent reports Sheikh Abdullah was "tired" of the job.
Sheikh Hamad bin Jassem, on the other hand, has been seen as one of the most influential figures in Qatari politics for years, observers say.
He moves from first deputy premier, and will keep his foreign affairs portfolio,
In the last 12 years,
Photo caption
Sheikh Hamad bin Jassem