According to preliminary figures from the central bank, the producer price index stood at 121.2 against the 2020 base of 100, up 0.3 percent from that of March.
The yearly growth has remained flat since March, the central bank said.
The biggest contributor to the increases in corporate prices for the month was the price of nonferrous metals, which rose 11.7 percent from a year earlier, while that of petroleum and coal products and other manufacturing industry products both rose 5.3 percent.
Local analysts noted that the yen-based import price index increased by 6.4 percent year on year, significantly up from the 1.4-percent rise in March, putting upward pressure on corporate prices.
The corporate goods price index, one of the country's important inflation gauges, measures prices that companies charge each other for goods and services.
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