Annual headline consumer prices declined for a 10th consecutive month in October, due mainly to low oil prices, providing the central bank room to keep interest rates low to support a weak economy.
The index, published by the Commerce Ministry on Monday, dropped 0.77% in October from a year earlier, less than forecast in a Reuters poll for a 1.00 percent decline.
The core inflation rate, which strips out raw food and energy prices, was little changed at 0.95% in October from 0.96% in September.
The ministry said last month it expected headline CPI to fall in a range between 0.2% and 1% this year but the risk of deflation was low.
Inflation has also been curbed by government price controls and stubbornly soft consumption since the May 22, 2014 coup.
The central bank's monetary policy committee has left the benchmark interest rate unchanged at 1.50%, near the record low of 1.25%, since surprise back-to-back cuts this year to shore up confidence.
The committee next reviews policy on Wednesday. Most economists expect no policy change but some see a further cut as the economy remains weak.
