"Golf has been growing in Germany ever since the 1980s and still is, and Martin came along at just the right time," double U.S. Masters winner Langer told the European Tour's official website (www.europeantour.com).
"Hopefully his victory will continue that trend and also add a little more. When I left the regular tour about three years ago, that's when Martin came along and took over as the role model.
"He has been the leading player in Germany ever since and I think he will go from strength to strength," added the 52-year-old Langer.
Kaymer, 25, became only the second major winner from his country when he beat American Bubba Watson in a three-hole playoff at Whistling Straits in Wisconsin on Sunday.
It was the sixth European Tour victory of his career, following the 2010 and 2008 Abu Dhabi Championships, the 2009 Scottish and French opens and the 2008 BMW International Open.
Langer, who won the Masters in 1985 and 1993, said: "I called Martin after his win on Sunday. I was pulling for him, I left a message on his phone to congratulate him.
"I thought he did extremely well. I am pleased he finally made the breakthrough (in a major) because a lot of people had high expectations for him.
"The Americans don't know him that well but in Europe he has been one of our young stars for a couple of years."
(Writing by Tony Jimenez; Editing by Clare Fallon)