Japan's foreign-exchange reserves swelled $6.67 billion from the previous month to $915.62 billion in April, setting a record high for the third month in row, the Finance Ministry said Friday.

The reserves expanded on interest income from Japanese holdings of U.S. Treasuries and other foreign securities, as well as valuation gains on the bonds driven by lower U.S. interest rates, a ministry official said.

The euro's rising strength against the dollar also inflated Japan's euro-denominated assets, the official added.

The euro was trading at $1.3647 as of the end of April, up from $1.3354 a month earlier.

Japan had $768.63 billion in foreign securities as of April 30, up from $762.31 billion a month before.

Foreign currency deposits came to $125.65 billion, down from $125.68 billion a month earlier.

Of the deposits, $6.70 billion were held in foreign central banks and the Basel-based Bank for International Settlements, $25.91 billion in Japanese banks and $93.03 billion in foreign financial institutions.