Last month's preliminary figures for the Corporate Price Index, which shows the prices of goods traded between companies, were 108.7, with the 2015 average of 100.
It is the same as last November, which was the highest level in 35 years and 11 months since Japan entered the bubble economy in December 1985, and it is still at a record high level.
The background is that the prices of raw materials such as crude oil continue to rise.
The corporate goods price index has exceeded the same month last year for 10 consecutive months, and the rate of increase last month is still at a high level of 8.5%.