The nationwide core consumer price index, which excludes volatile fresh food items, rose for the 14th straight month, the data showed, beating a 3.5 percent increase forecast by economists here.
The latest data showing inflation in Japan hit its highest level since February 1982, came on the heels of September's 3.0 percent increase and again topped the Bank of Japan's (BOJ) 2 percent target.
The CPI has remained above the BOJ's 2 percent target for seven straight months, but the Japanese central bank believes that the current global inflation crisis is temporary.
The bank's commitment to its ultra-easy monetary policy is in contrast to other major central banks who have aggressively hiked their interest rates to tame soaring inflation.
The widening interest rate gap between the BOJ and its global peers, particularly the U.S. Federal Reserve, has resulted in the Japanese currency dropping to a series of 32-year lows versus the U.S. dollar.
The yen's persistent weakness of late has driven up import costs for energy products including liquified natural gas and coal, as well as food products, the downside effects of which are being felt by households in resource-poor Japan.
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