Steinbrueck is the former Social Democrat, or SPD, leader of North Rhine-Westphalia, who had the difficult job managing the finances of Germany's ailing Ruhr industrial heartland.
The SPD got eight of 14 ministry posts after allowing conservative Christian Democratic Union leader Angela Merkel the chancellery Monday.
Frank-Walter Steinmeier was named Foreign minister, while the other ministry posts going to the SPD are those in Justice, Health, Environment, Transport and Development Aid.
Neither the SPD nor CDU won enough support in the Sept. 18 election to form a government, forcing them into a coalition situation.
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