Intermediate goods prices declined 0.6% on the month in May, while prices of capital goods were down 0.5%, the data showed.
Prices in the consumer and durable goods sectors inched up 0.2% on the month each, while energy prices were stable on the month.
In annual terms, industrial prices rose 2.6% in May, boosted by higher prices in all sectors, the data showed.
Consumer goods prices increased 6.4% in May from the year-earlier month, while energy prices rose 4.7% on the year. Prices of durable goods increased by 2.3% year-on-year, while intermediate and capital goods were by 0.2% and 0.1% more expensive.
International industry prices decreased 0.6% on the month in May and were down 1.8% compared with the same period of 2012, INS data showed.