The seasonally-adjusted production in all industries, which exclude the agricultural, forestry and fishery sectors, fell 0.3 percent in March from the previous month, according to Statistics Korea.
Output from the services industry tumbled 4.4 percent in March, marking the biggest monthly fall since data began to be compiled in 2000.
It came as people refrained from outside activity such as shopping, traveling, eating out and social gatherings amid the social-distancing campaign to contain the viral spread.
Output in the lodging and eatery industry plunged 17.7 percent in March from a month earlier, and production in the transport and warehousing sector diminished 9.0 percent.
Production in the culture and leisure sector dropped 31.2 percent, and output in the wholesale and retail industry slipped 3.3 percent.
Meanwhile, production in the mining and manufacturing sector advanced 4.6 percent in March from a month earlier.
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