German investor confidence jumped sharply in June, a key survey showed Tuesday, as the outlook improves for Europe's biggest economy following the announcement of a peace deal in the Middle East.

The ZEW institute's economic expectations index rose 20.7 points from negative territory in May to reach 10.5.

Analysts surveyed by the financial data firm FactSet had expected the index to rise less sharply and remain in negative territory.

"Financial market experts expect the Iran conflict to be nearing an end," said the institute's president, Achim Wambach.

"This is likely to ease the massive pressure on energy prices and inflation, which would benefit energy-intensive industries and private households and would strengthen domestic demand."