Olaf Scholz will be sworn in as German chancellor on Wednesday, leading a three-party government that takes over from Angela Merkel after 16 years in office.
The German parliament, where his coalition has a substantial majority, will first vote him into office, BBC reported.
The handover of power also marks an end to Mrs Merkel's 31-year political career.
Scholz, a soft-spoken 63-year-old, steered the Social Democrats to election victory in late September, positioning himself as continuity candidate because he played a key role in the Merkel government as vice-chancellor.
After the vote in the German parliament, the Bundestag, he will go to see President Frank-Walter Steinmeier before returning at midday (11:00 GMT) to be sworn in. He is set to take over from Mrs Merkel at 15:00.