The seasonally-adjusted production in all industries, which exclude agricultural, forestry and fishery sector, retreated 2.5 percent in April from the previous month, according to Statistics Korea.
Output in the mining and manufacturing industry declined 6.0 percent last month, logging the biggest monthly fall in over 11 years since December 2008.
The coronavirus pandemic weakened global trade, leading to a double-digit reduction of export in the month.
Production in the services industry gained 0.5 percent in April from a month earlier.
Retail sale, which reflects private consumption, advanced 5.3 percent last month, and facility investment grew 5.0 percent.
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