Booming shipments of cars and electronics in August drove up Japan's exports at the fastest pace in nearly four years, further evidence that overseas demand is strong enough to support healthy economic growth.
The 18.1 percent annual increase in exports was the fastest since November 2013 and handily beat the median estimate for a 14.7 percent annual rise seen in a Reuters poll.
August's export result was well up on July's 13.4 percent, and marked a ninth straight month of expansion.
Export growth is seen likely to continue as the global economy remains on a solid footing, which should underpin policymakers' confidence in Japan's economic outlook.
The Bank of Japan is expected to keep monetary policy on hold at a meeting ending on Thursday as inflation remains confusingly low despite data pointing to solid economic growth.