A reading above 100 means optimists outnumber pessimists, while a reading below the benchmark means the opposite.

Consumer sentiment had remained rather gloomy since the beginning of the year with the index dipping to 98 in February, down from 100 registered in January.

The local economy, the fourth-largest in Asia, has been struggling with sluggish spending and sagging exports.

Korea's exports dropped every single month since the start of last year.

Also on Tuesday, the BOK said the country's economy expanded only 0.4 percent from the previous quarter in the first three months of the year, slowing from a 0.7 percent on-quarter growth in the fourth quarter of 2015.

Private spending shrank 0.3 percent in the January-March period, a turnaround from the 1.4 percent expansion in the previous quarter.

More expected improvements in economic conditions down the road, along with better conditions for their livelihood, the BOK data showed.

An index measuring people's sentiments toward their future livelihood came to 98 in April, up from 97 the previous month. A separate index gauging people's sentiments toward their future spending also moved up to 106 from 105 over the cited period.

More people also expected improvements to their income levels with an index measuring the people's sentiment toward their income levels one year from now coming to 113 in April, up from 112 a month before. (Yonhap)