Japan's of gold, convertible foreign currencies, and special drawing rights fell by a hefty $ 1.82 billion in October to $ 84.29 billion, the Finance Ministry said.
The total marks the sixth consecutive monthly decline.
The protracted downturn reflects the intensity of Bank of Japan since June, when the U.S. currency temporarily surged above the 150.00 yen.
The announcement follows a sharper $ 2.2 billion in the country's in September to $ 86.12 billion.