Taiwan's consumer confidence index (CCI) slipped to 62.08 in May, down 0.39 points from April, the Economic Development Research Center at National Central University said Wednesday.

The decline was driven by weaker sentiment across five sub-indicators, with confidence in stock investment opportunities posting the largest monthly drop.

The sub-indicators that dropped are investing in stocks, which recorded the largest decline, purchasing durable goods, domestic economic outlook, household financial situation and employment opportunities. Meanwhile, expectations for price levels over the next six months recorded the only increase among the six indicators.

All six core sub-indicators point toward pessimism among consumers, the report said.