The seasonally-adjusted production in all industries, which exclude agricultural, forestry and fishery sectors, declined 1.2 percent in May from a month earlier, Statistics Korea data showed Tuesday.
The industrial production continued to slide for the fourth consecutive month with falls of 2.5 percent in April, 0.3 percent in March and 3.5 percent in February respectively.
Output in the mining and manufacturing industry tumbled 6.7 percent in May from the previous month, while the production in the services sector increased 2.3 percent last month.
Retail sale, which reflects private consumption, gained 4.6 percent in May from a month earlier.
Facility investment diminished 5.9 percent, and completed construction shrank 4.3 percent in the month.