They were among 34 lawmakers with immigrant backgrounds to win seats in yesterday's election, up from 21 in the previous term, said the Migration Media Service, a group that provides facts and figures on immigration in Germany.
Although nearly one in five of Germany's 80 million people are immigrants, or the children or grandchildren of immigrants, relatively few have made it into the federal legislature.
Until now there were no black lawmakers in Parliament, despite more than 500,000 people of recent African origin believed to be living in Germany.
The 51-year-old, who gained German citizenship in 2001, said his priority would be to promote equal opportunities in education. "Every child born in Germany should have the chance to be successful in school regardless of their social background or the income of their parents," he said.
More From This Section
The other black lawmaker elected was Charles M Huber, a 56-year-old actor born in Munich to a Senegalese father and a German mother. Huber is a member of Chancellor Angela Merkel's Christian Democratic Union, which won the election with 41.5 per cent of the vote.
Several lawmakers of Turkish origin have previously been elected to the lower house, but most were with the Social Democratic Party, which Diaby represents, the environmentalist Green Party or the Left Party.
"Measured against the 630 seats in Parliament, some 5.4 per cent of deputies now come from immigrant families," the Migration Media Service noted. "In the population as a whole their share is more than three times as high, with about 19 per cent.