The import price index stood at 119.73 in July, up 3.3 percent from the previous month, according to the Bank of Korea (BOK).
It continued to gain since May as the raw material price went up. From a year earlier, the index soared 19.2 percent last month.
Price for imported mining products advanced 4.8 percent, and the import price for coal and oil products spiked 8.1 percent last month.
Dubai crude, South Korea's benchmark, increased 1.9 percent in July on a monthly basis.
The import price for computer, electronic and optical devices added 3.4 percent, and those for electrical equipment and chemical products rose over 3 percent.
The export price index came to 111.19 in July, up 3.5 percent from a month earlier. It kept an upward trend for the eighth consecutive month since November last year.
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