Eurozone investor confidence increased strongly in November, surpassing economists' expectations, to hit a two-and-a-half year high, a monthly survey by the think tank Sentix showed on Monday.

The investor confidence index rose for the fourth consecutive month to 9.3 from October's 6.1. Economists were looking for a modest increase to 6.5.

The latest score is the highest since May 2011 and the strongest among rest of the world, the research group said. Investors assessed the current economic situation better than last month, the survey said.

The current situation index climbed to -3.3 from -8.5, while the expectations index rose to 22.8 from 21.8.

German investor confidence hit a record high of 30.2 in November, Sentix said, the score being the highest since the series began in 2009. In October, the score was 28.3. An improvement in investor expectations drove the index higher, the group said.